Conversation so far:
What happened to the musician Hide in 1987?
Hide joined X Japan in February 1987.
Who were the other members of X Japan besides Hide?
Yoshiki was the drummer for X Japan.
What did X Japan do?
What happened to the musician Hide in 1989?
X 's major label debut album, Blue Blood, was released on April 21, 1989 and debuted at number six on the Oricon chart.
How did X Japan's album Blue Blood do?
It debuted at number six on the Oricon chart. It earned the band the Grand Prix New Artist of the Year award at the 4th annual Japan Gold Disc Awards.
Are there any other interesting aspects about Hide and X Japan?
Shortly after the release of Art of Life, which also topped the Oricon, the members of X Japan took a break, to start solo projects.

Question: What were some of their solo projects?
Self-contained rewrite: What were some of Hide and other X Japan members solo projects?