On their lp So Much For Dreaming.
Joni Mitchell [author]
Miek & Roel [as De Cirkel]
Chuck Mitchell [Joni's ex; they both introduced the song as if they were Ian & Sylvia before Joni went solo; there's a radio recording (for WDAS FM from Philadelphia) circulating on a fan-site]
Sanne [as Met De Molen Mee]
Just like Judy Collins with Both Sides Now, Ian & Sylvia cut a Joni Mitchell song before Joni. Written to mirror Sugar Mountain from her compatriot Neil Young, song she plays live in '66 on Joni Mitchell Archives Vol 1 boxset.