I know I've already given my 10, but I'm going to be greedy.

A.L.Lloyd and Ewan MacColl. "Leviathin" Riverside.
Sam and Kirk McGee, with Arthur Smith. "Folkways"
Louis Armstrong's Hot Five. RCA.
The Blue Sky Boys. Camden (RCA)
The Delmore Bros. Greatest Hits. King. The Delmores are my favourite band of all time. This album is of later stuff (40s) but all their recordings are great.
Flatt and Scruggs at Carnegie Hall. Columbia
The Weavers at Carnegie Hall. Vanguard. If someone wanted to know what the folk revival was all about in one album, I might suggest this one.

Only seven this time. I wanna give someone else a chance.
Rick