"My Heart's Symphony" is a 1966 song written by Glen Hardin and performed by Gary Lewis & the Playboys, and featured on their 1966 album, (You Don't Have To) Paint Me a Picture. The song was produced by Snuff Garrett and Leon Russell and arranged by Russell and Hardin.
In the US, "My Heart's Symphony" reached #13 on the Billboard Hot 100, ending the group's seven-top 10 hit streak. Outside the US, it went to #31 in Canada, #36 in the United Kingdom, and #98 in Australia.