Question: Who is affiliated with more bands, Ronnie James Dio or Luca Prodan?
Context: Holy Dio: A Tribute to Ronnie James Dio is a compilation album, released on January 25, 2000.  It is a tribute album to Ronnie James Dio, featuring covers of several songs he had sung during his time with Rainbow, Black Sabbath and his own band Dio.  The covers done on this tribute album were recorded by mostly power metal bands. The following is a comprehensive discography of Dio, an American heavy metal band led by vocalist Ronnie James Dio.  Dio was formed in 1982 after Ronnie James Dio and drummer Vinny Appice left Black Sabbath.  The band went through frequent personnel changes.  The final line-up consisted of Dio (vocals), Craig Goldy (guitars), Rudy Sarzo (bass), Simon Wright (drums) and Scott Warren (keyboards). Dio is a cover album by Norwegian rock singer Jørn Lande, (released under his stagename "Jorn") released in July 2010.  The album was recorded as a tribute to the late Ronnie James Dio and consists of covers of songs from Dio, Black Sabbath and Rainbow, with one original composition written for Ronnie James Dio.  Lande describes the album as a "fine collection of songs that present the music of the Man and the Artist, with a unique twist" and a "sincere and heartfelt “thank you” to a great and influential Artist" who "has affected my life and career in such a way that without his presence, I would not have become the artist I am today".  A music video for the song "Song for Ronnie James" was released on YouTube.  The announcement of the album did not pass off without critique however, as Lande was accused of exploiting the death of Dio.  Frontiers Records President released a statement in which he denies those accusations and explains that the albums had been in the works since spring of 2009, before Dio's death in May 2010.  In South America the album is called "Song For Ronnie James". Magic: A Tribute to Ronnie James Dio is a compilation album, released on 15 June 2010.  It is a tribute album to Ronnie James Dio, featuring covers of several songs he had sung during his time with Rainbow, Black Sabbath and his own band Dio. Ronnie James Dio – This Is Your Life is a 2014 tribute album to singer-songwriter Ronnie James Dio, lead singer of several heavy metal bands including Elf, Rainbow, Black Sabbath, Heaven & Hell, and his own band Dio.  The album features many of Dio's contemporaries performing songs originally recorded by Dio.  Tenacious D won the Grammy Award for Best Metal Performance at the 57th Grammy Awards for their cover of "The Last in Line", and Anthrax were nominated in the same category for their cover of "Neon Knights". "Song for Ronnie James" is a song by Norwegian heavy metal singer Jorn from the tribute album "Dio".  It was written as a tribute to the deceased Ronnie James Dio who died a couple of months earlier.  The song is the only on the album which isn't a Dio / Black Sabbath / Rainbow cover.  It has been performed live many times but the most notable was at "Brew House" Gothenburg, Sweden when the crowd sang almost the whole song.  Clocking at 8:07 it is the longest track on the album. Metal Hits is a compilation album by the heavy metal band Dio and was released in 2005 by Rhino Flashback Records.  Multi-instrumentalist and heavy-metal mainstay Ronnie James Dio built up a hefty back catalog over the decades, with a career that spans vocalizing for Rainbow, Black Sabbath, and of course, his own group, Dio.  This best-of, which covers the Dio years exclusively, spans the period 1983's Holy Diver and 1990's Lock Up the Wolves, and is packed with the kind of high-octane performances Dio fans have come to treasure.  Neo-Gothic masterpieces like "Sunset Superman" and "Dream Evil" share space with the metal mysticism of "Last in Line," while Dio's hell's-gate scream holds sway over all. Luca Prodan (17 May 1953 – 22 December 1987) was an Italian–Scotish musician and singer.  He was the leader and singer of Sumo, one of the most influential rock bands of Argentina, and is widely considered as one of the most important artists of the last quarter of the twentieth century in his country. "Man on the Silver Mountain" is the first single by Rainbow and the first track of their debut album, "Ritchie Blackmore's Rainbow".  Written by guitarist Ritchie Blackmore and singer Ronnie James Dio, this song is, as Dio said, "a semi-religious one, a man on the silver mountain is a kind of God figure everyone is crying out to".  This track became one of Rainbow's best-known tracks and was also a live favourite for any Rainbow line-up, and also the band Dio.  The words "The man on the silver mountain Ronnie James Dio" are inscribed on his grave. Ronald James Padavona (July 10, 1942May 16, 2010), better known by his stage name Ronnie James Dio, was an American singer, songwriter, and musician.  He fronted and/or founded numerous groups including Elf, Rainbow, Black Sabbath, Dio, and Heaven & Hell.  He is credited with popularizing the "metal horns" hand gesture in metal culture and was known for his medieval-themed lyrics.  Dio possessed a powerful versatile vocal range capable of singing both hard rock and lighter ballads.
Answer: Ronnie James Dio