Album was composed by and was released on February 28, 2012. Soundtrack consists of 13 tracks tracks with duration over about 35 minutes. Album was released by Interscope Records.
CD 1
| 1 | Let It Grow (Celebrate the World)Ester Dean | 03:39 |  |
| 2 | Thneedville (feat. The Lorax Singers)Fletcher Sheridan, Antonio Sol, Beth Anderson, Oliver Powell, Edie Lehmann Boddicker, Missi Hale & Rob Riggle | 02:44 | |
| 3 | This Is the Place (feat. The Lorax Singers) [Tricky Version]Ed Helms | 02:24 | |
| 4 | Everybody Needs a Thneed (feat. The Lorax Singers)Ed Helms, Randy Crenshaw, Fletcher Sheridan, Edie Lehmann Boddicker, Monique Donnelly, Ty Taylor & The 88 | 01:31 | |
| 5 | How Bad Can I Be? (feat. The Lorax Singers)Ed Helms | 02:52 | |
| 6 | Let It Grow (feat. The Lorax Singers)Fletcher Sheridan, Dan Navarro, Edie Lehmann Boddicker, Jenny Slate, Claira Titman, Betty White, Rob Riggle & Ed Helms | 03:17 | |
| 7 | Let It Grow Gospel Ending (feat. The Lorax Singers) [Original Demo]Jenny Slate | 00:52 | |
| 8 | Thneedville (feat. The Lorax Singers) [Original Demo]Fletcher Sheridan | 03:58 | |
| 9 | The Once-ler's Traveling Madness (Original Demo)Ed Helms | 01:35 | |
| 10 | I Love Nature (feat. The Lorax Singers) [Original Demo]Randy Crenshaw | 02:43 | |
| 11 | You Need a Thneed (feat. Antonio Sol, Fletcher Sheridan & Taylor Graves)Keith Slettedahl & The 88 | 01:32 | |
| 12 | Nobody Needs a Thneed (feat. The Lorax Singers) [Original Demo]Fletcher Sheridan & Randy Crenshaw | 01:52 | |
| 13 | Biggering (feat. The Lorax Singers) [Original Demo]Gabriel Mann, Randy Crenshaw & The 88 | 05:01 | |
