Last.fm recommendations:

• TV on the Radio
• The Doors
• A.C. Newman
• Architecture in Helsinki
• Paul Simon
• I'm From Barcelona
• Joan Baez
• Lou Reed & John Cale
• PJ Harvey
• Jefferson Airplane
• Brian Eno & John Cale
• Morissey

Recommendations from friends:

• Bon Iver
• Fleet Foxes
• National
• The xx
• Explosions in the Sky

Artists I've seen live and should therefore download:

• Primus/guy from Primus
• Jeff Beck

The "how did you live 19 years without having any music by them?" list:

• THE ROLLING STONES
• NEIL YOUNG

Miscellaneous reasons/sources:

• Echo & The Bunnymen
• Orbital