"Fill Your Heart" is a song written by singer-songwriter Biff Rose

Biff Rose

Paul "Biff" Rose is an American comedian and singer-songwriter.Born in New Orleans, Rose first came to prominence as a banjo-toting standup comedian, profiled in Time magazine in 1965. By 1966 he moved to Hollywood, working as a comedy sketch writer with George Carlin for a host of television...

 and Paul Williams

Paul Williams (songwriter)

Paul Hamilton Williams, Jr. is an Academy Award-winning American composer, musician, songwriter, and actor. He is perhaps best known for popular songs performed by a number of acts in the 1970s including Three Dog Night's "An Old Fashioned Love Song", Helen Reddy's "You and Me Against the World",...

, in 1966. It was first released on Rose's debut album The Thorn in Mrs. Rose's Side. Tiny Tim

Tiny Tim (musician)

Tiny Tim , , born in Manhattan, was an American singer and ukulele player. He was most famous for his rendition of "Tiptoe Through the Tulips" sung in a distinctive high falsetto/vibrato voice.-Rise to fame:Born to Lebanese parents in 1932, Khaury displayed musical talent at a very young age...

 released his version as the B-side of his hit single "Tiptoe Through the Tulips

Tiptoe Through the Tulips

"Tiptoe Through the Tulips" is a popular song originally published in 1929. The song was written by Al Dubin and Joe Burke .‘Crooning Troubadour’ Nick Lucas’ recording of "Tip-Toe Through The Tulips" hit the top of the charts in May 1929. The song he introduced in the 1929 musical talkie Gold...

", and later on his debut album, God Bless Tiny Tim

God Bless Tiny Tim

God Bless Tiny Tim was the first album by Tiny Tim. Released in 1968 on the Reprise label, it included "Tip-Toe Thru' The Tulips With Me" , a version of "I Got You Babe", and a collection of more obscure songs. Many of the songs have humorous lyrics, are sung for humorous effect, or have an...

, both in 1968. It was later covered by David Bowie

David Bowie

David Bowie is an English musician, actor, record producer and arranger. A major figure for over four decades in the world of popular music, Bowie is widely regarded as an innovator, particularly for his work in the 1970s...

 on his 1971 album Hunky Dory

Hunky Dory

Hunky Dory is the fourth album by English singer-songwriter David Bowie, released by RCA Records in 1971. It was Bowie's first release through RCA, which would be his label for the next decade...

, replacing another Bowie track, "Bombers

Bombers (David Bowie song)

"Bombers" is a song written by David Bowie. It was recorded in 1970 and intended for the album Hunky Dory, but was replaced at the last minute by the cover "Fill Your Heart"...

", at the last minute.