Bands like Led Zeppelin and AC/DC are deciding not to take advantage of the many new roots and limbs of the royalty tree. And to their detriment imo. As for LZ - I actually find the tribute bands and other LZ tunes on Spotify refreshing, creative, and - well, better, than the the stodgy old heard-a-million-times renditions. So, rock on LZ and ACDC - I got you on my ipod which I hardly use anymore - Spotify and it's future iterations and offspring are the new frontier in music availability. Pink Floyd came around - so to will LZ and AC, and any other dinosaurs out there.