Although not important to many commercial swing bands improvisation was a very important part of popular swing band led by

The correct answer is Benny Goodman.
Goodman was known as "The King of Swing" due to his skills on the clarinet. His jazz band was one of the most influential bands at the time (mid 19th century). He was famous for improvising a lot, in order to show his true potential and musical craft. 

1/5 = 9/45
2/9 = 10/45

10/45 + 9/45 = 19/45

45/45 - 19/45 = 26/45

your answer is 26/45

hope this helps