UnScramble this Word: a t u a n e n l?

Questions

what does the lead singer of the knack, famous for "my sharona," & jack kevorkians lead defense attorney have in common?

What does the musical term 'adagio' mead?

What Dorsey brother played the clarinet and alto sax?

what drug did j.j. cale & eric clapton sing about?

what drummer got his nickname because he wore so many rings?