Question: When was the heavy metal guitarist and vocalist born who was replaced with Roland Grapow in Pink Bubbles Go Ape?

Context articles: Roland Grapow
Pink Bubbles Go Ape
The Four Seasons of Life
The Dark Ride
Sole Survivor (Helloween song)
Kai Hansen
Masterplan (band)
Rabbit Don't Come Easy
Helloween
Kids of the Century

Roland Grapow (born 30 August 1959 in Hamburg, Germany) is a professional guitarist and music producer.
 Grapow is best known for his time in the leading power metal band Helloween, who he played with for 12 years after replacing founding member Kai Hansen.
 He subsequently created the power metal band Masterplan in 2001, which is still active today.
Pink Bubbles Go Ape is the fourth studio album by German power metal band Helloween, released in 1991.
 It marked the departure of guitarist Kai Hansen, with Roland Grapow replacing him.
 Musically it was written with a softer, less epic, and sometimes humorous approach, which would be later fully implemented in the band's following album "Chameleon" (1993).
The Four Seasons of Life is the debut solo album released by former Helloween guitarist Roland Grapow.
 The album is unique compared to its successor, Kaleidoscope, because Roland sings lead vocals on all tracks.
The Dark Ride is the ninth studio album by German power metal band Helloween, released in 2000.
 The album's style was quite different from "Better Than Raw" as it had a much darker sound, very tuned down guitars, and gruffer vocals.
 The album was produced by renowned figures Roy Z and Charlie Bauerfeind.
 It is also the last studio album to feature guitarist Roland Grapow and drummer Uli Kusch, both of whom were fired after completion of the supporting tour for the album.
 They went on to form the band Masterplan.
"Sole Survivor" is a song and a single made by the German power metal band Helloween taken from the album "Master of the Rings".
 On "Closer to Home", the lead vocals are sung by Roland Grapow.
 The song has been covered by the Swedish power metal band Dragonland on their third album 'Starfall'.
Kai Michael Hansen (born 17 January 1963) is a heavy metal guitarist and vocalist.
Masterplan is a German power metal band, founded by guitarist Roland Grapow and drummer Uli Kusch upon leaving Helloween in 2001.
Rabbit Don't Come Easy is the tenth studio album by German power metal band Helloween, released in 2003.
 It is the first Helloween album to feature Sascha Gerstner on guitars, who replaced Roland Grapow.
 No drummer is listed in the band line-up for this album.
 Mark Cross was hired for the position before recording, but only managed to complete two tracks ("Don't Stop Being Crazy" and "Listen to The Flies") before being forced to leave due to illness.
 Mikkey Dee of Motörhead played on the rest of the songs on a session basis.
 The Japanese version contains a cover of Accept's "Fast as a Shark," with the band's new drummer, Stefan Schwarzmann.
Helloween is a German power metal band founded in 1984 in Hamburg, Northern Germany by members of bands Iron Fist and Gentry.
 Its first line-up consisted of singer and guitarist Kai Hansen, bass guitarist Markus Grosskopf, guitarist Michael Weikath, and drummer Ingo Schwichtenberg.
 After the release of a self-titled EP and their debut album "Walls of Jericho" in 1985, it expanded into a quintet with the addition of singer Michael Kiske, Hansen choosing to focus on guitar instead.
 Under this line-up, they released the "Keeper of the Seven Keys" albums (1987 and 1988), which established Helloween as a notable heavy metal band and led to the creation of the power metal subgenre.
 However, Hansen left the band quickly after the release of "Part II" and was replaced by Roland Grapow.
 He then created the band Gamma Ray.
"Kids of the Century" is a song and single by the German power metal band Helloween taken from the album "Pink Bubbles Go Ape".
 This is the first Helloween single with Roland Grapow playing guitars, replacing Kai Hansen.
 It is also the first Helloween recording with a song written by bassist Markus Grosskopf: "Shit and Lobster".