To download as a samlpe is ok. nothing worse to buy a cd and find out the band is crap. If i like the band then im all for buying the album.
share the music but let the artist see dollars as well
Really, I believe that as long as you are supporting the band, you're doing more for them than giving Apple your money. Download their music and then go to their shows and buy merch. That'll help them more than anything else.
Cd /vinyl or hard disk
well, downloading is more portable, although buying the CD/vinyl could sound a little better and is a lot cooler