I used to play alone a lot, and I notice there's a tendency to adopt strange rhythms that people have trouble playing along with when you do that... or to not maintain a robust rhythm at all, which sounds neat when you're alone, but adding other instruments becomes difficult.
The more I play with a band (particularly a drummer) the more I develop robust rhythm-keeping. Piano works great alone because of the register range and ability to sound more than 6 notes at a time. Guitar tends to turn out kind of folky, or just like it's missing a part when it's played alone.
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