Dorothy Wiley films four letters - a letter from her friend, a letter from worms, a letter from bugs, and a letter from her son. She and Bob and Diane Nelson whistle popular favorite classics for the soundtrack.
The film by Brakhage commonly referred to as "Wecht" does indeed exist. It doesn't have a titlecard at the head, and the leader of the original is labeled "Portrait" in Stan's handwriting, so I'm not sure where the 'Wecht' title comes from.
Young adventurer Gipo owns one fifth of a rock illustrating the location of a rich gold mine. Risking his life more than once and with the help of the beautiful hooker, Lulu Belle, our hero sets out to recover the missing pieces.