There is the oft’ cited advice to “never master your own music,” but I like to say that it’s fine to master your own music if you have skills in that area - but always find some way to bring in another musical talent somewhere in the creative process.
It’s interesting that listening to your own music the next day (or later) can give you a fresh perspective, but I think that the real lesson here is to actually get another person involved instead of working in isolation.
It’s great that technology allows a single musician to create a piece entirely on their own, but as a listener I’ve noticed that even my favorite artists are overshadowed in their solo work by the collaborations that they do. Geir Jenssen and Mark Van Hoen are about the only exceptions, in that their solo work stands on its own, but even they have some larger groups that occasionally take the music to the next level (HIA+Biosphere, Scala).
