melodies sounding together is counterpoint (note against note). The term counterpoint is used when the melodies that are sounding simultaneously are independent and are more or less of equal importance. Both rhythm, pitch but also timbre can be used to achieve independence.
a chord
a chord
A Chord
yes
chord, cord
When u burp and say yep at the same time. It means yes, or what's up, or a sort of mating call sounded when a male sees an attractive girl passing by. There are other definitions in the Urban Dictionary, link below.
it would be best to call at the same time because sun hits New York at the same time as it hits Massachusetts
They are photogenic, and they sounded good (and looked good) on TV. But I'm not sure we could call them "great," even if their fans love them.
standard time zone
twins
quadruplet
time zone