Earliest known recording by The Nebe Quartett (1907).
Other popular recordings by Nat “King” Cole (1960), Vince Guaraldi Trio (1965), They Might Be Giants (1992).
From the wiki: “‘O Tannebaum’ is a German Christmas song. A ‘Tannenbaum’ is a fir tree. Based on a traditional folk song, it became associated with the traditional Christmas tree by the early 20th century and sung as a Christmas carol. The modern lyrics were written in 1824, by the Leipzig organist, teacher and composer Ernst Anschütz, but do not actually refer to Christmas or describe a decorated Christmas tree. Instead, they refer to the fir’s evergreen qualities as a symbol of constancy and faithfulness.”
Nat “King” Cole, “O Tannenbaum” (1960):
Vince Guaraldi Trio, “O Tannenbaum” from A Charlie Brown Christmas (1965):
They Might Be Giants, “O Tannenbaum” (1992):