I couldn't find a decent upload of the soundtrack anywhere so I decided to upload it myself. I didn't rip these but supposedly they're the files straight from the game. I had to go through and rename them all.

Wing Ding

High Tide Ride

Super Mario 3D Land: Original Sound Version

Blue Sky Athletics

Mario and Luigi Partners in Time OST 008 - Main Battle Theme

Ice Mario - Super Mario Galaxy

Super Mario Galaxy 2 Original Soundtrack

Fated Battle

The Giant DX - Mario And Luigi Bowsers Inside Story + Bowser Jr.s Journey OST

Mario Party 9

Now You've Done It

Mario Party 9 - Now You've Done It

Overworld Theme - Super Mario 3D Land

This music is from the original game.  Give credits to Nintendo when used.

The Final Battle - Super Mario 3D Land

24. King K. Rool & Ship Deck 2

The Final Battle - Super Mario 3D Land

monkey ass