Makes sense to me:
1940 - Billboard publishes its 1st singles record chart (#1 is "I'll Never Smile Again" by Tommy Dorsey, vocal by Frank Sinatra)
1962 - Dmitri Shostakovitch completes his 13th Symphony (known as "Babi Yar")
1963 - 1st surfin' record to go #1-Jan & Dean's "Surf City"
1965 - Bob Dylan's "Like a Rolling Stone" was released.
1968 - Iron Butterfly's "In-a-gadda-da-vida" becomes 1st heavy metal song to hit charts, it comes in at #117
1968 - Cream's "Wheels Of Fire" hits #1
1975 - Steve Van Zandt (also known as Little Steven) performed for the first time in concert as a member of Bruce Springsteen's E Street Band.
So, for history's sake, here's Dorsey and Sinatra from 75 years ago this week...