This is Peter Neubäcker from Celemony. You've probably already seen this promo video of his new product, Direct Note Access. It's a new version of the autotune-type pitch correction software which - it appears - can work with polyphonic sound. Record a chord, and it lets you explode that chord and re-tune individual notes. I thought that this was impossible. Peter Neubäcker says "What doesn't work in theory can still work in reality."
You could have many favorite songs. But you may want to hear some songs now and the others later. How to put songs in order on iPod can be answered by creating playlists.