It means that there are two or more male African singers singing in there highest register and the two people are singing different rhythms.
i hope this answer is what you want
pokemon952
i know this is not in the answer but please can someone comment hints of the bast way to answer questions
thanks
--EDIT--
You Could (Not Always) Start as A Full Sentence when the Question is a bit out of sense but since the Q and the A are close you don't need it. Your Answering was good.
You may be having difficulty singing in falsetto is your voice has changed. You can try taking voice lessons to get your skills back on track.
falsetto
I'm a professional classical baritone and I can tell you that is completely normal to have your falsetto range extend beyond your chest voice.
In singing, falsetto is when a person sings above or beyond their normal vocal ranges.
Tenor in men, treble in boys. Falsetto is more of a gimmick than a gift.
he sang beautifully in falsetto.
The Dream - Falsetto
falsetto : a form of vocal production used by male singers to extend their range upwards beyond its natural compass by limiting the vibration of the vocal cords.
Falsetto is a way for a man to sing higher than his normal range. He sang the chorus in a loud falsetto.
Gino Falsetto was born on April 23, 1981.
He sang the high notes in falsetto, reaching impressive pitches during the chorus of the song.
Smokey Roninson is falsetto. He is a well known singer.
He sang the high notes in a falsetto voice, creating a hauntingly beautiful melody.
The Scottish Falsetto Sock Puppet Theatre was born in 2005.
The Scottish Falsetto Sock Puppet Theatre was created in 2005.
He sang the high notes in falsetto during the performance.
You missed a 't' 'artificially high; above the normal voice range; "a falsetto voice" ' Typed 'define: falsetto' into google. Source: http://en.wikipedia.org/wiki/Falsetto