Question: Which American singer-turned-entrepreneur released "Hits of the 50's", a cover album featuring renditions of classics by Cole, Avalon and Day?

Context articles: Nina Sings the Hits of Diane Warren
Testify to Love: The Very Best of Avalon
Songs from the Mirror
Libera: The Christmas Album
Sam Cooke
Cinema (Andrea Bocelli album)
Hits of the 50's
Reborn (Avalon album)
Rachelle Ann Rocks Live!
Under Cover

Nina Sings the Hits of Diane Warren is the fourth studio album by Filipina singer Nina, released in the Philippines on July 25, 2008 by Warner Music.
 It is a cover album consisting of Nina's renditions of familiar love songs written by American songwriter Diane Warren.
 The idea behind the release of the album started after the success of her single "I Don't Want to Be Your Friend" in 2004, which was initially recorded for Warren's love songs compilation.
Testify to Love: The Very Best of Avalon is Avalon's seventh release—the group's first greatest hits collection—and is titled appropriately after the quartet's hit, "Testify to Love".
 It is the first album showcasing Melissa Greene, who replaced Cherie Adams, and the last album featuring founding member Michael Passons.
 Although mostly consisting of previous radio hits, three new songs were added—"New Day", "Everything to Me", and "Pray", with a bonus Christmas song.
 "Wonder Why" has an alternate opening from the original album version.
Songs from the Mirror is the third solo album by Scottish singer-songwriter Fish, released in 1993 as his final album for Polydor.
 It does not contain any original material; instead it is a cover album featuring Fish's versions of songs by artists who inspired him before his career started.
 It reached 46 on the UK Albums Chart.
Libera: The Christmas Album is a studio album by South London-based boy vocal group Libera featuring renditions of Christmas carols and popular Christmas-themed songs.
 The album was titled "Winter Songs" in Japan.
 The Deluxe Edition contains 2 additional tracks: "Lullabye (Goodnight My Angel)", which can also be found in their "Peace" Deluxe Edition album, and a remix of their song "Gaudete" under the new title "Gaudete - Canticum Novum".
 The Japan release came with a DVD, an additional track named "I Vow To Thee My Country", and some Christmas extras which can also be found in the Deluxe Edition.
 The DVD contains two music videos: a video for "Song of Life", and an outdoor version of the "Eternal Light" video previously published on the "Peace" Deluxe Edition album.
 It was released in 2011 via record label EMI Classics.
 Libera first released the song "Joy To The World" as a free download in summer 2011.
Samuel Dale "Sam" Cook (January 22, 1931 – December 11, 1964), was an American singer, songwriter, and entrepreneur.
Cinema is the fifteenth studio album by Italian classical tenor recording artist Andrea Bocelli.
 The album, featuring renditions of classic film soundtracks and scores, was released on October 23, 2015 through Sugar Music and Universal Music Group.
 A Spanish-language version of the album was also released and has been nominated Album of the Year at the 17th Annual Latin Grammy Awards.
 "Cinema" received a nomination for Best Traditional Pop Vocal Album at the 59th Annual Grammy Awards held in February 2017.
Hits of the 50's is the sixth studio album by American singer-songwriter Sam Cooke.
 Produced by Hugo & Luigi, the album was released in August 1960 in the United States by RCA Victor.
 "Hits of the 50's" is a covers album consisting of Cooke's versions of songs by such artists as Nat King Cole, Frankie Avalon, and Doris Day.
Reborn is Avalon's thirteenth release and their ninth studio album.
 It is the first album featuring Amy Richardson as a member of Avalon and the first full album to feature Jeremi Richardson.
 It also marks the first album with E1 Music as Avalon's new record label.
 Released on September 15, 2009, "Reborn" contains the radio singles "Arise" and "Alive"; "Arise" peaked at the No. 1 position on "Billboard"'s Soft AC/Inspirational National Airplay radio chart in late 2009, garnering Avalon their 22nd career No. 1 hit.
Rachelle Ann Rocks Live!
 is the first live cover album by Filipina singer Rachelle Ann Go.
 Recorded at Live at 19 East in 2008, the album marks Go's first attempt to do a live album featuring cover versions of song by Survivor, Bon Jovi, The Rembrandts, Bryan Adams, Ambrosia, and Aerosmith, among others.
Under Cover is the ninth studio album by heavy metal vocalist Ozzy Osbourne.
 The album consists entirely of cover songs.
 This is Osbourne's first and only album to feature cover songs from various artists, although in 1982, Osbourne had released the live album "Speak of the Devil" featuring renditions of songs from his time with Black Sabbath.
 All but 4 songs were originally released in the box set "Prince of Darkness", released earlier the same year.
 The additional songs on this album which are not featured in "Prince of Darkness" are "Rocky Mountain Way", "Sunshine of Your Love", "Woman" and "Go Now".