This article is from the The Osbourne FAQ, by Mike L. with numerous contributions by others.
After the release of the 1984 Bark at the Moon album and subsequent tour,
Ozzy began work on the long awaited Ultimate Sin album. The Ultimate Sin
would come out in 1986, ending the long wait by his fans. It would also be
one of the poorest amongst the opinions of Ozzy and his fans as well. The
album's sound was cheesy and according to Ozzy, most of songs ended up
sounding alike (which they do).
On March 19/1987, due to overwhelming demand by his fans, Ozzy also
released the Randy Rhoad's Tribute album. Randy's mother, Dolores had
dozens of letters from fans wanting to know if there were any more Randy
concerts out there. She then contacted Ozzy who searched through his house
and came up with some old archive material. The material was sent to Max
Norman who had produced Ozzy's first three albums, to see if the material
was suitable. The result was the Randy Rhoad's Tribute album. Ozzy also
played only one show that year, at the HMP Wormwood Scrubs prison in the UK.