If you're a famous musician, it's easy to feel like you are doing the same thing over and over. Sometimes you just need to mix it up and do something different. Play a style of music you aren't known for, or collaborate with a new group of musicians.
Of course, this can come at a cost, as the "musical side project" is often code for "pretentious, navel-gazing mediocrity." But there are some definite exceptions to this rule, which is why we're debating what belongs on the Rushmore of Musical Side Projects.
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