Am very lucky that we're having some music practice rooms built over the holidays. We currently don't have any! What size should these rooms be? I've read a previous post on here that says 2x2m is too small. What would be a good 'small' room size? And what about a bigger space, eg. a 'rock band' room, with space for drum kit, amps, guitarists, singer, etc. Thanks for your advice.