Question: Mikkey Ekko's first-charting material was released on which of Rihanna's albums?

<P0-S0> "Stay" is a song recorded by Barbadian singer Rihanna for her seventh studio album, "Unapologetic" (2012). <P0-S1>  It features guest vocals by Mikky Ekko, and was released as the second single from the album on January 7, 2013. <P0-S2>  "Stay" was co-written by Ekko and Justin Parker. <P0-S3>  The song's lyrical content speaks of temptation and the inability to resist true love. <P0-S4>  Music critics were generally positive in their opinion regarding the balladry, with most describing it as a standout track on the album, though a few labeled it as boring. <P0-S5>  The song was featured on the third-season finale of the TV Show Younger. <SEP> <P1-S0> The discography of King Diamond, a Danish heavy metal band, consists of twelve studio releases, two live albums, five compilations, six singles, and four music videos. King Diamond was formed in 1985, after the dissolution of the group Mercyful Fate, by vocalist King Diamond, guitarists Andy LaRocque and Michael Denner, bassist Timi Hansen, and drummer Mikkey Dee. <P1-S1>  The following year, the band released their debut album "Fatal Portrait", which charted at number 33 in Sweden. <P1-S2>  King Diamond's second studio album, "Abigail", was released on February 24, 1987, and reached number 123 in the US, number 39 in Sweden and number 68 in the Netherlands. <P1-S3>  Following some line-up changes, the group released the album ""Them"" in 1988, which peaked at number 38 in Sweden, number 65 in the Netherlands, and at number 89 in the US, making ""Them"" King Diamond's highest charting album in North America. <P1-S4>  The following year, the band released the follow-up album "Conspiracy", which charted at number 111 in North America, number 41 in Sweden and at number 64 in the Netherlands. <P1-S5>  In 1990, after more line-up changes, King Diamond released the album "The Eye", which only charted at number 179 in the US, which makes "The Eye" King Diamond's lowest charting album in North America. <SEP> <P2-S0> Good Girl Gone Bad Live is the first live long-form video by Barbadian singer Rihanna. <P2-S1>  It was first released on June 9, 2008 by Def Jam Recordings. <P2-S2>  The DVD and Blu-ray release features Rihanna's concert at the Manchester Arena in Manchester, United Kingdom held on December 6, 2007, as part of her Good Girl Gone Bad Tour (2007—2009) which supported singer's third studio album "Good Girl Gone Bad" (2007). <P2-S3>  Most of the concert's set list originates from "Good Girl Gone Bad", however, Rihanna also performed songs from her previous albums "Music of the Sun" (2005) and "A Girl like Me" (2006). <P2-S4>  It also contains a special Documentary Feature that presents Rihanna discussing her experiences during the tour. <SEP> <P3-S0> Mikky Ekko (born John Stephen Sudduth; December 17, 1984) is an American recording artist and record producer from Louisiana, signed to RCA Records. <P3-S1>  He is best known for being featured on Rihanna's 2013 single "Stay", which has charted in multiple countries worldwide, becoming Ekko's first-charting material. <P3-S2>  Ekko released his debut studio album, "Time" in January 2015 through RCA Records.