Joe: "The leftists don't seem to use traditional music for propaganda..."

Seeger disagreed with you. He was of the opinion ALL songs are propaganda of one sort or another (tho the logic was a bit stretched as I recall) and all folk songs are political in nature.

He was just very, very smooth at misdirecting the introductions. Unless you were there and heard the "party line" that came between the songs, the playlist itself seemed fairly apolitical.