The line was mostly rapped, but the ZIP code was sung.
The mail-in request became a pop culture reference for its music exhortation to "Write ZOOM, Z-Double-O-M, Box 3-5-0, Boston, Mass 0-2-1-3-4: send it to ZOOM!". These activities were introduced by such titles as ZOOMovie, ZOOM Play of the Week, ZOOMrap (later ZOOMchat), ZOOMgame, ZOOMdo, ZOOMgoody, ZOOMphenomenon, etc.
ZOOM encouraged children to "turn off the TV and do it!" On the show, a cast of (usually) seven kids (known as ZOOMers) present or perform various activities such as games, plays, poems, recipes, jokes, songs, movies, science experiments, and informal chats on such subjects such as hospitals, prejudice, etc., all suggested by viewer contributions.