Doo Wop time again. Adding to my modest portfolio of Doo Wop songs, written with the I-vi-IV-V chord progression. 'In The Still Of The Night', written by Fred Parris 1956, and performed by Fred Parris and The Five Satins.
For the ukulele players, I teach a doo wop strum this way:
Using the the I-vi_IV-V chord progression (C-Am_F-G7), a waltz strum would be in 3/4 time.
Double that speed and use a 6/8 strum, with the emphasis on the fourth beat. You have a Doo Wop strum.