The young man playing the banjo is Mark Erickson, 1946-2019. He was the older brother of Paul Erickson, ’67 and Jon Erickson, ’68. The other fellows are unidentified, These photos were included in Mark’s obituary video.

More likely these four were just playing for fun, without actually being a band, The blond guy with the guitar looks familiar. 

Anyone know who they are?