Keep All of Them !!! You'll be sorry you sold them..................maybe not not now ...........but at some point.
I use digital music ....Itunes etc................but....
When I find something I like I always purchase the CD...................
They never leave my house....................I just burn a copy................
Sometimes I'll find something on the Itunes store.....buy it......then search for a hard copy on line and order that as well.
Itunes and mp3's are handy.............but there is a noticeable difference in audio quality........................compressed music doesn't hit as hard and lacks depth..............
I have also noticed some of the recordings with lower levels don't compress well at all............