I'm 31, but I recall the piano at the hall. My mother and one other 'sister' handled the piano duties on a regular basis. Mom, being the better of the two, played the piano during
most meetings while the other 'sister' was the 'backup'.
Our congregation was in a small town, rural midwest U.S. so we might have kept our piano longer than most congregations did. I believe we finally stopped using it in the mid to late
'80s Even after we switched to the recorded music on tapes, we had a lot of problems with the system, so the piano was kept on hand as a backup and was still used quite often.
I did enjoy that aspect of it. The music and singing seemed quite real and genuine.
Later, around 1999 when I was attending another congregation in the minneapolis area, the kingdumb hall still had a piano there. I just now remember it because during a lunch break
from preaching, we were at the hall, and two hardcore pioneer 'sisters' insisted upon playing the piano and having a sing along using the kingdumb melodies ofcourse.