There is a lack of rap in these suggestions, and it's a problem. My two entrepreneur-related favorites:

1. "Ima Boss"- Meek Mill Feat. Rick Ross http://www.youtube.com/watch?v=nW4Acfqzpz4

2. "You Ain't Got Nothing On Me" - Lil Wayne ft. Juelz Santana and Fabulous http://www.youtube.com/watch?v=W5iJ1673r1o&feature=relat...

Anything by Rick Ross or Lil Wayne never fails to get me motivated to do some work.

Intriguing Possibilities, by Trent Reznor, from The Social Network

http://www.youtube.com/watch?v=2vvs4__2XRI

Amazed this wasn't the first one listed, in fact!

That's only for 19-year olds working on mobisociofoto apps. Peldi's got a real business :-P

Takin' Care Of Business by Bachman-Turner Overdrive:

http://www.youtube.com/watch?v=Ch7X2Zisxu4&feature=relat...

:-) Hope you're not workin' at nuthin' all day, though.

I always enjoyed this particular song from my favourite composer Diane Warren when I am feeling down "When I am Back On My Feet Again" http://www.youtube.com/watch?v=pdsq2bJxkG8

For me it's always The Underdog by Spoon http://www.youtube.com/watch?v=q1hZVDLkJDc

I've never heard a song that better sums up the feeling of building something incredible.

This one seems to be missing from the list

Don't stop me now - Queen http://www.youtube.com/watch?v=HgzGwKwLmgM

I'm going to date myself, I guess.

"Best I can", Queensryche

"Circumstances" / "Something for nothing", Rush

I was expecting hip hop for some reason..

Oh yes, Ben Horowitz's blog always has some.

"Poor Jack" from the Nightmare before Christmas: http://www.youtube.com/watch?v=LXXOO3Wd_5Q. One of the best songs for this purpose ever, it never fails to pick you up.