I would also guess '90s.
One of the many slices of the 10@10 data I am curious about is the distribution of years over
the days of the week. For a while it seemed like Dave often ended the week by playing a '60s
set on Friday. For myself, I'm less likely to expect a '60s set in the middle of the week, or a '90s
show on Friday. I wonder if there actually is a skew in the distribution or if it's just my imagination.