It means trying to sing fast and to the rhythm of the music (it is actually talking with sonnet, because of musical very little).
NOT CHANTEAR IT IS "CHANTEO". Which means to sing liricalmente fast and the rhythm of the music examples: Noriel, almigithy, wisin, etc.
chantear is incorrectly written and should write it as "chante" being its meaning: Be out of tone
chantear is incorrectly written and it should be written as "Chanteo" being its meaning: It is when a singer expresses his lyric as if he were talking fast and rhythm music.