Delayed response, sorry, this isn't a very active sub.

Not sure what you're looking for. Tips on how to get into shows? Or photo techniques? I'll try to answer both from the perspective for someone new. Some of this you might already know, but I'll put it here regardless, just in case.

Photo passes, pit etiquette

1. Passes aren't a gimme. You need to ask the publicists or promoters of the band for a photo pass. You need to do some digging on Google for that. the best thing to do is start small and ask local bands. A lot of cities will have venues that are OK with you bringing a camera. You just need to find out which ones. Get started by shooting bands at those places, as they are a great place to get your feet wet.
2. A significant majority of places will have a rule that you can't use your flash. Don't break this rule. It's obvious and the shot you're going to get probably isn't going to be on the cover of a magazine, so it's not worth risking getting kicked out.
3. Respect the concert attendees. They paid to be there, and often times you didn't. Be polite, chat them up between sets. If you need to be in their way, do it sparingly and get your shot quickly.
4. Respect the other shooters. Don't camp in one spot, it limits your shots, and takes away from an angle that the other shooters might want. If you need to cross in front of someone, try to avoid ruining their shot, or if you need to cross their field of vision, do it quickly. Chat these folks up, too. They are a great resource for other places and opportunities. Many of the places I shoot now, I got access to through other photographers and their connections.
5. Respect the authority of those in charge at the venue. They decide where and when you can access certain places. fighting them on it is a quick way to the door. If you've got time, chat up the security staff working the pit. They might give you better access to places, sometimes. Sometimes the places that you're told you have access to are different from what the security guys were told. If this happens, don't fight with security. Find the person in charge, (tour manager, etc.) and have them correct it. (This implies you were given access, of course. If you're just free-wheeling at a show, you're out of luck). When you get to a venue, they will most likely lay down the rules. Usually it's no-flash, and the first three songs from the pit.
6. No pit pass? Then show up early. You'll want to be there for the openers. You'll look like a douche if you show up as the headliner is going on and you worm your way to the front like you were asked to do so. Showing up early and shooting the openers is great practice, too. Both for the purpose of figuring out the lighting of that event, and as a whole when getting started with this endeavor.
7. Don't bring a huge bag into the pit. It's limited space and you're filling it with everything you own. Bring your camera, and maybe one more lens. Keep it small and simple. This will help you be more agile there, anyway. Tiny bag, or no bag at all.

Photo Techniques

1. Know this: Music Photography can be very challenging. You're often working with little to no light, subjects that move constantly and unpredictably, a short timespan to get the shots (sometimes), and lighting scenarios that can confuse even the best sensors and meters.
2. Know this: It's often because of this challenge, that it can be so fun. It can be frustrating at first, because you find that you're expectations and reality are often times far apart.
3. If you're shooting shows indoors, you'll likely be working with higher ISOs. That's just the cost of doing business. Put it up to a point where your shots are still locking down a frozen scene at the aperture that you're comfortable with (this will vary by taste. I like mine razor sharp, others like a bit of movement and blur in their shots).
4. Your camera's metering system will often struggle to make heads or tails of the situation you're shooting. Take for example that many venues have the artist lighted, but a solid black backdrop. If your camera meters this in either average mode (where it meters the whole image it sees) or evaluative mode (where it meters a certain point you choose plus the area around it), it will see a whole bunch of dark black and slow the shutter down (or open the shutter wider, depending on which mode you choose), to make up for what it thinks is a lack of light. You can compensate a bit with exposure compensation, but eventually you'll find it's better to learn the light situations and go manual. It gives you more control on this. Personally — and this is a personal preference — I never drop below 1/160 for action shots. I adjust my aperture and ISO to ensure I get that. Helps me lock in that scene with minimal motion blur.
5. Lenses: The faster the better. I'm not saying go out and buy the expensive stuff, but if you've got a choice, go for lenses with faster maximum apertures. I started with a nifty fifty (50mm f1.8) and it worked great. That f5.6 lens you might have will struggle in low-light situations. Primes (fixed lenses with no zoom) are great for this, but some people prefer to have the zoom. Just know that the tradeoff is usually that they have slower max apertures, or they are very expensive.
6. Try to shoot each member of the group, not just the main singer. if all your shots are of the same person, it gets boring. Try different angles, different perspectives, different framing, etc. for each. Be sure to get wide shots if you've got the equipment for it. Get some of the crowd, too. Remember, a great photo tells a story, so try to show that with the photos you take; in your own style.
7. Find other photographers whose style you like and try to learn from them. Don't copy their style outright, but trying to emulate when getting started could help you figure out things in the long run about your own style.
8. When editing, be ruthless. Both Joe McNally and Scot Kelby have said this in the past, but the photos you show are what everyone sees and evaluates you on. If there's anything less than your best, it shouldn't be included. Sometimes (myself included), people have a tendency to want to show more photos so it looks like they have more to show. But if they aren't ideal in your eyes, then they are only going to diminish your overall aesthetic to everyone. This applies to all photography, of course.

I hope this helps in some way. Again, not sure of what level you're at, so apologies if any of this sounds remedial (or over your head, for that matter).

In case it matters, here's a couple of my shots so you know at what level I'm coming from (I'll let you decide that; so you know if I'm either full of shit in your eyes, or I know what I'm talking about). Supersuckers | Enslaved | Frankie Teardrop | OK Go | The crowd at Edward Sharpe | St. Paul and the Broken Bones | Lucius