Here is what I pull out every spring after the first couple weeks of spring training have gone by and the weather starts to warm up:

1. Take Me Out to the Ballgame - Hary Caray
2. Rock & Roll, Pt. 2 - Gary Glitter
3. Centerfield - John Fogerty
4. Who's on First? - Abbot & Costello
5. Joltin' Joe DiMaggio - Les Brown & His Orchestra
6. Glory Days - Bruce Springsteen
7. The Greatest - Kenny Rogers
8. Na Na Hey Hey Kiss Him Goodbye - Steam
9. I Love Mickey - Teresa Brewer
10. Move Over Babe (Here Comes Henry) - Bill Slayback
11. Did You See Jackie Robinson Hit That Ball? - Buddy Johnson
12. Wild Thing - The Troggs
13. Burn On - Randy Newman
14. We Are The Champions - Queen
15. Bobby Thompson's Shot Heard Round the World - Russ Hodges
16. A Dying Cubs Fan's Last Request - Steve Goodman
17. Catfish - Bob Dylan
18. Walk of Life - Dire Straits
19. I'm Sitting On Top of the World - Bobby Darin
20. Farewell Speech (1939) - Lou Gehrig
21. I Love L.A. - Randy Newman

Some thoughts on the songs:

1. Hary Caray started the tradition of singing 'Take Me Out to the Ballgame' during the 7th Inning Stretch.
2. Gary Glitter is a worthless human being. Who wrote one of the best sports songs of all time.
3. 'Who's On First' is how comedy should be. I think of this act every time I try to give Saturday Night Live! one more chance to prove they are still funny. It normally descends into some unfunny preverted skit that is intolerable...just look at Abbot & Costello!
4. 2006 NLCS, game 7. Mets fans, father and son, crying. My joy at their expense. Na Na Na Na Hey Hey Hey Goodbye.
5. Mickey sounds like a complete tool in 'I Love Mickey.' 
6. 'Move Over Babe' should have been featured in an original Scooby Doo episode.
7. Major League also featured 'Burn On' in addition to 'Wild Thing' (which you knew).
8. Steve Goodman should have stopped with his first Cubs song and never written 'Go Cubs Go.'
   
9. 'Walk of Life' has no baseball reference but makes me think of the game. Personal favorite.
   
10. 'I'm Sitting On Top of the World' was featured in the 2006 (or maybe 2007) all star game commercials. Pujols was sitting on the steel frame of an unfinished skyscraper.

Songs that didn't make the cut (mainly because they are terrible):

1. Love is Like a Baseball Game - The Intruders
2. Talking Baseball (Cardinals) - Terry Cashman
3. Baseball Boogie - 1986 Dodgers (I can't even watch the whole thing its so bad.)
   
4. Meet the Mets (1964)
5. Sweet Caroline - Neil Diamond (WHAT? Why is this on baseball lists?)
6. Go Cubs Go - Steve Goodman
7. Baseball, Baseball, Fun in the Sun - Dora the Explorer

I'd love to hear more suggestions (other than the excluded ones). This list has been carefully compiled over the last three or four years using as many resources as I could find including iTunes Essential's Baseball playlist. I hope you enjoy it!