Mister Rogers' Neighborhood (1968)

S1E34 Red Monster Pt 4: Musical bottles

Episode 0034 begins with Mister Rogers showing up with a glass bottle in hand. He creates melodies by blowing across various bottles filled with water. During this visit, Mr. McDonald drops by to showcase a piece from Die Meistersinger on his tuba. Meanwhile, in the Neighborhood of Make-Believe, Digger Digorum is called upon to embark on a mission to uncover the secrets surrounding the enigmatic red monster.