Song Artist/Date/Label Remade by
U.S. Male Jerry Reed 9-9-66
on lp RCA Victor 3756 Unbelievable Guitar & Voice Of Jerry Reed
Elvis Presley
Unchain My Heart Otis Williams 9-12-60
King 5880 (1964)
Ray Charles, Joe Cocker
Unchained Melody Les Baxter 1-17-55
Capitol 3055
Al Hibbler (2-4-55), Roy Hamilton, June Valli (3-15-55), Vito & Salutations, Righteous Bros., Elvis Presley, Sweet Inspirations et al.
First heard as instrumental theme music by Alex North, with a vocal version by Todd Duncan, in the 1955 film Unchained. As far as I can tell, Duncan's recording has not been released commercially, although his 1:19 version from the movie has been posted on YouTube.

A 1991 CD titled Unchained Melody, The Film Themes Of Alex North (Bay Cities 3010) includes "Unchained Melody." It's noted as being the original film recording but it seems to be stereo. Although there were stereo films beginning in the early '50s, it's questionable whether a relatively minor production as Unchained would utilize such an expensive process at that time.

At least one source lists Baxter's recording date as 1-15-55.

A story that's been discredited as a hoax had it that one William Stirrat, posing as real lyricist Hy Zaret, claimed to have written "Unchained Melody's" words as a sixteen-year-old in 1936, some 15 years before it was performed.

Under Your Spell Again Buck Owens 6-16-59
Capitol 4245
Johnny Rivers
Unicorn, The Shel Silverstein 11-13-62
on lp Atlantic 8072 Inside Folk Songs
Irish Rovers, Dr. Dog
Universal Soldier Highwaymen 1963 (rel. 9-63)
United Artists 647
Buffy Sainte-Marie, Donovan, Glen Campbell
The Highwaymen learned the song from writer Buffy Sainte-Marie while they appeared together at NYC's Gaslight Cafe.

Until It's Time For You To Go Buffy Sainte-Marie 1965
on lp Vanguard 9171 Many A Mile
Buffy Sainte-Marie (1965 on Vanguard 35028), Neil Diamond, Elvis Presley
Buffy Sainte-Marie also had a 1970 issue of the song (Vanguard 35116) that was her original with added strings. Her 1965 single was a new recording that also included chorus and orchestration.

Another notable, if somewhat obscure, remake was by future Monkee Mike Nesmith. His early 1966 single (Colpix 792) was issued under the name Michael Blessing.

Until You Come Back To Me (That's What I'm Gonna Do) Stevie Wonder 4-4-67
on lp Motown 804LP3 Looking Back (1977)
Aretha Franklin
Up A Lazy River see Lazy River
Up Tight Good Woman (aka Up Tight, Good Man) Wilson Pickett c. 10-66
on lp Atlantic 8138 The Wicked Pickett
Spencer Wiggins, Solomon Burke, Laura Lee
Co-writer Dan Penn's demo has been issued.

Urge For Going Tom Rush 1966
Elektra 45607
George Hamilton IV, Tom Rush (1968 on lp Elektra 74018 The Circle Game), Joni Mitchell, Crosby, Stills & Nash, Luka Bloom
Writer Joni Mitchell's publishing company was named Gandalf, after the Hobbit character, but was misspelled on this pressing of Rush's single.