If you’re serious about your band, then it is worth the expense of paying an entertainment attorney to draw up a legal agreement so you can set the parameters of your partnership in place right from the start. Otherwise, you’re setting landmines for yourself in any future dealings between bandmates. If you’re all professionals, approaching the band about this shouldn’t be difficult. If someone balks, you’ll know right away that this isn’t someone you should be partnering with to form a long-term business venture.