I believe you are looking for "Why Don't You & I" recorded by Alex Band (of The Calling) & Santana.
From Wiki:
Kroeger wrote and sang on "Why Don't You & I" for Santana's Shaman. However, when Arista decided to release the song as a single in Summer 2003, Kroeger's label, Roadrunner, refused permission, citing concerns that Kroeger appearing on a "high-profile single" would compromise the excitement over Nickelback's fall 2003 release The Long Road. Kroeger is the one that recommended The Calling's Alex Band, another Arista artist, as a replacement for re-recording the single. The recording with Kroeger on vocals can easily be found on most peer-to-peer networks to this day, however.
Them that can, do; them that can't... memorize Artist and Title