Before that I relied on grooveshark, last.fm, youtube, and, a long time ago kazaa and napster. I can't be the only one. There are just too many 'free' alternatives.
When the 'barely paid' content producers would have gotten zilch if it weren't for Spotify, I wouldn't say that they're being shat on.
On another note, few would bemoan the plight of ISPs being paid less per bits transferred than they were a decade ago, why should we consider it a bad thing that per unit prices of content have dropped? Are the top artists of today any poorer than their counterparts from the 80s? Would the smaller artist even exist if it weren't for the proliferation of these cheap and convenient content delivery services?
It just works, is fast and has a large db of content.
http://support.spotify.com/us/learn-more/faq/#!/article/How-...
http://help.rdio.com/customer/portal/articles/187730-rdio-fo...
It's also good to pay for a service that you want to stick around.
I've been using Mog for a while, but had I run into Rdio first, I might have picked them instead.
Pivots frequently keep a large part constant, thus the word makes sense.