These are the Sesame Street Number of the Day segments being fandubbed. Skip to 14:54 for the segment for #20 for all of the notes. https://youtu.be/m9Jbh8_X1us?si=guBr7NG9sRDrJdsh  Pipes #2, 6, and 18 were voiced by Fran Brill (who also performed Zoe, Prairie Dawn, and countless others on Sesame Street). For the end of every segment, all of the organ pipes sing, shout, and cheer the number of the day with a big ensemble of voices. Voices are needed for organ pipe voice ensembles that are absent for segments #2 and #13.

Pipe #2‘s note is C#4, voice is similar to Zoe from Sesame Street

Pipe #6’s note is F4, voice is similar to Prairie Dawn from Sesame Street

Pipe #18‘s note is F5, similar to Pipe #6 but one octave higher, has cutesy voice

Must have a vocal range of C4 to A5 and be able to sing with a high voice.