Longest continuous playing songs


I like (and looking for) continuous playing music, it could be one song or a group of songs that play uninterrupted, the longer, the better. Does anybody have any suggestions?

Thanks for any suggestions,

Steve
sc2
Why don't you use an iPod or iTunes. You can make your own mix and play for hundreds of hour non stop.
In-A-Gadda-Da-Vida by Iron Butterfly. At about 17 minutes, one of the longest classic single rock songs.
Pink Floyd-

Atom Heart Mother from Atom Heart Mother- 23:44

Echoes from Meddle- 23:29

Shine On You Crazy Diamond (Parts I-V) from Wish You Were Here- 13:31

Shine On You Crazy Diamond (Parts VI-IX) from WYWH- 12:28

Dogs from Animals- 17:06

John