Depends what type of relaxing, like levels innit?
For me –
Level 1 (ie driving up the M5 after rush hr) – Miguel Migs, Naked Music, Lisa Shaw, Kyoto Jazz Massive, mix of Underworld’s downtempo ambient stuff
Level 2 (ie driving down the M5 at 2am) – D J Shadow, Nick Drake, David Axelrod, Ella Fitzgerald
Level 3 (ie recumbent after working hard) – Guqin classical Chinese zither (ie Wang Fei), Orb ‘Live 93’
Level 4 (ie in need of dark room, lengthy solitude and a good cerebral shower) – Gas – ‘Zauberberg’. (In fact whole discography, but Zauberberg more often than not)
[video]http://youtu.be/kVxnbBkCIJA[/video]