Here's the situation: You've got a whole bunch of old Van Morrison CDs from an era in which you worshipped the man, but you don't listen to them much anymore. Adding to that storage problem, there's a stack of old rockers gathering a layer of dust on your bookshelf, along with some stuff friends gave you that you never really liked in the first place. And that's not to mention those Christmas albums from some party way back when. Grab them all and head on down to Amoeba, whose helpful staff will take your oddball musical selections and give you credit for something new. Because, well, maybe you're into jazz now. And you're trying to collect the complete works of John Coltrane. But you can't exactly afford to do it at the big expensive store with the neon sign downtown. There are few things more fickle than tastes in music, so the buy, sell, and trade idea seems to be the right one. (After all, your discards are someone else's new discovery.) And the end result at this store is also a wonderful selection of tunes beyond Top 40 at prices affordable enough to encourage trying something new.