Dave Matthews Band top Diffuser.fm's Top 40 Songs of September 2012 list with 'Mercy,' the lead single from the forthcoming 'Away From the World' album, which hits stores Sept. 11. DMB recently unveiled a new James Frost-directed video for 'Mercy' that features a bounty of fan-shot footage, and

No Doubt climb into the No. 2 slot with 'Settle Down,' the first single off  'Push and Shove,' their forthcoming comeback album. 'Push and Shove' is No Doubt's first full-length disc since 2001's 'Rock Steady,' and 'Settle Down' perfectly introduces the disc in anthemic fashion. Green Day, meanwhile, trumpet the arrival of their forthcoming ’¡Uno!,’ ‘¡Dos!,’ and ‘¡Tre!’ trilogy of albums with 'Oh Live,' a spunky dance track that has been earning more than a few comparisons to Franz Ferdinand.

New to our Top 40 Songs tally this month include tracks from Mumford and Sons, Grizzly Bear and the Dirty Heads' 'Up All Night,' a stone groove featuring current tour mate Matisyahu. And there are plenty more where those come from, so check out our Top 40 Songs of September 2012 list and see what's heating things up.

Top 40 Songs – September 2012

1. Dave Matthews Band -- 'Mercy'
2. No Doubt - 'Settle Down'
3. Green Day - 'Oh Love'
4. Imagine Dragons - 'It's Time'
5. Muse - 'Survival'
6. Band of Horses - 'Knock Knock'
7. The xx - 'Angels'
8. The Killers - 'Runaways'
9. Mumford and Sons - 'I Will Wait'
10. The Lumineers - 'Stubborn Love'
11. Bloc Party - 'Day Four'
12. Black Keys - 'Little Black Submarines'
13. Of Monsters and Men – ‘Little Talks’
14. Grizzly Bear - 'Yet Again'
15. Snow Patrol – ‘This Isn’t Everything You Are’
16. Crystal Castles - 'Plague'
17. My Morning Jacket - 'Outta My System'
18. Dinosaur Jr. - 'Watch the Corners
19. The Walkmen - 'Heartbreaker'
20. The Gaslight Anthem, 'Teenage Rebellion'
21. The Dirty Heads (Feat. Matisyahu) - 'Up All Night'
22. Animal Collective - 'Today's Supernatural'
23. Edward Sharpe and the Magnetic Zeros - 'That's What's Up'
24. Ultraista - 'Static Light'
25. First Aid Kit - 'Wolf'
26. Bat for Lashes - 'Laura'
27. Group Love - 'Tongue Tied'
28. Gotye - 'Eyes Wide Open'
29. John Frusciante - 'Walls and Doors'
30. No Doubt - 'Push and Shove'
31. Muse - 'Madness'
32. Trey Anastasio - 'Let Me Lie'
33. Dirty Projectors - 'Buckle Up'
34. The Presets - 'Ghost'
35. The Wallflowers - 'Reboot the System'
36. Ben Gibbard - 'Teardrop Windows'
37. Cat Power - 'Ruin'
38. Calvin Harris - 'Sweet Nothing'
39. Black Keys - 'Gold on the Ceiling'
40. Reptar - 'Houseboat Babies'