I have three moods; listening to music i haven't heard before, listening to music i haven't listened to in a long time (like over 6 months), or listening to some music that i have been recommended to by friends or the rare times of letting an algorithm decide for me.
I usually utilize P2P as a library kind of thing; listen to an album or so from an artist or band or composer... then delete it; while i keep the ones i really enjoy and would do with the second mood.
I rarely ever stream; it's the bane of musical diversity.