I did a lot of bands recording in studios photography back in the days of real film.
Thinks to keep in mind are:
They are there to record, not to have photos taken, so don't get in the way, and you can't make noise (even the shutter can be out if they are doing vocals)
You can't just wander about as there is a sound lock between the sound desk and the studio. so you are either in for the take or out for the take.
The lighting is either crap, shite or dim, and not much you can do about it and chances are the producer or sound engineer will not want you setting up lamps .
Studios are often lit by strip lights which give photos an odd pink or blue colour
The walls & celings of sudios are usually dark/black, often covered in carpet or foam, so have zero reflective qualities. so bouncing the flash may not work. It may be a good idea to get the band to dress in white
The walls of the studio can often be quite 'busy' with wires, sockets, set lists, graffiti, posters etc. therefore it can be best if the band is plain, so no hawaiian shirts.
You can get some good pics from the mixing desk to the band in the studio and vice versa, but you have to factor in the sheet of glass in between. It may be worth taking along some glass cleaner and doing the window before everyone is in position
Make sure you know the manager and the tour manager/head roadie they are the people that are more important than the band. The sound engineer is top dog, get in his way and he will throw you out.
Studios are often very small spaces, so the technique is to imagine trying to photograph a Christmas party of 10 people crowded around a table in a very small dining room, with people trying to serve food whilst the kids throw a tantrum. Oh yes, and you are probably shooting from outside the dining room window or through the serving hatch from the kitchen which is equally busy.
