Actors have crossed over to singing top 40 hits, and vice versa, almost as long as there has been a top 40 chart at all. Obviously there were Elvis and Sinatra doing quite well on both fronts, but there were many, many others who had various degrees of success. Do you remember Shaun Cassidy, Rick Springfield, Jack Wagner? You might even recall the top 40 entries by Bruce Willis, Don Johnson, and Eddie Murphy. Now – show of hands – who remembers when there was a very successful top 40 hit from…Joey Lawrence?