Investigation Discovery says it's an ID original, so we won't be able to find it anywhere. But feel free to message them and ask if they can release it on iTunes. Maybe if they get enough people asking, they will.
The song is an ID original, but the artist is Niki Barr from the Niki Barr Band:
Chat with our AI personalities
Not sure, but I thought it sounded like Christina Perri - and apparently Investigation Discovery (channel) has used one of Christina Perri's songs for one of their other shows in the past.
You can download the song from the related link.
That song is "I Love You, Ono" by Stereo Total.
Love on the plate
The artist Common sings the Peace, Love and Gap song in the Gap commercial.
The song in the commercial for Must Love Kids is "Suddenly I See" by KT Tunstall. The song was released in 2005.
Joss Stone