Duo is a compilation album by Richard Marx (a sixth for Marx) and, Vertical Horizon vocalist, Matt Scannell. The disc debuted on May 12, 2008, exclusively through RichardMarx.com and is now available for sale at their concerts together as well. Marx and Scannell exhibit both of their acclaimed works. Marx remade a version of "Always On Your Mind," for his 2008 album Sundown. The disc is predominantly done on acoustic guitar aside from the track "Give You Back" performed on piano. This album did not contain a personal dedication from either artist.

1. Always On Your Mind
2. Sunshine
3. Endless Summer Nights
4. We Are
5. Hazard
6. Give You Back
7. Love Goes On
8. Echo
9. Your World
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