Afterwards, May made significant changes, feeling the group never quite gelled. May brought guitarist Jamie Moses on board to replace Mike Caswell. The other change made was in the backing vocals department, when Ryder, Stockley and Thompson were replaced with Catherine Porter and Shelley Preston . On 23 February 1993, this new line-up of The Brian May Band began its world tour in the US, both supporting Guns N' Roses and headlining a few dates.  The tour would take them through North America, Europe (support act: Valentine) and Japan. After the tour ended on 18 December 1993, May returned to the studio with fellow surviving Queen band members Roger Taylor and John Deacon to work on tracks that became Made in Heaven , the final Queen studio album.  The band took Mercury's solo album demos and last recordings, which he managed to perform in the studio after the album Innuendo was finished, and completed them with their additions both musically and vocally.  Work on the album after Mercury's death originally began in 1992 by Deacon and May, but was left until a later date, due to other commitments.