descant

1 to give a formal often extended talk on a subject an English professor who loves to descant on his beloved Shakespeare Synonyms declaim, talk, discourse, expatiate, harangue, lecture, orate, speakRelated Words recite, soliloquize; dissert, expound, pontificate, sermonize; mouth, spout; filibuster

2 to produce musical sounds with the voice the soprano descanted above the melody line Synonyms carol, chant, sing, vocalizeRelated Words belt, croon, harmonize, hum, lilt, quaver, scat, sharp, slur, trill, troll, warble, yodel; serenade