Instrumental on piccolo. Sidekick in the oldest recorded Arkansaw Traveler (see there). Written in 1833 as The Long Ago, first published and a hit in 1843.
Roxy King [first vocal version recorded]
Tonika Frese [as Lang, lang ist's her]
Andrews Sisters [melody in Don't Sit Under The Apple Tree in film Private Buckaroo]
Glenn Miller [idem; n°1 US]
Kay Kyser [idem]
René & The Alligators [as Knockin' On Your Window]
Peter Kraus [as Lang, lang ist's her]
Arbeid Adelt! [as Roodborstje on EP Jonge Helden, correctly mentioning the Long Long Ago link (see footnote)]
Gorillaz [violin in Left Hand Suzuki Method]
Dutch children song Roodborstje Tikt Tegen 't Raam uses the same tune. That one circulates since 1866 (with lyrics by JJA Goeverneur).