breaking of music band

Its very hard to build a popular music band group.Most of the boy band raise but can not stay alive.Ihere are another reason for breaking a famous boy band,when a boy band get popularity in worldwide,the lead vocalist of the band left the group for his solo carrier.In that reason,usually those bands broke up,as American pop band N'SYNC, American Christian Rock band PLUS ONE,Irish pop band WESTLIFE,Irish pop band BOY ZONE,etc.Justine Timberlake was the one of the lead vocalist of American pop band N'SYNC.This band got popularity in very short time.They gave some hit track  like ''BUY BUY BUY'', ''I WILL NEVER STOP'',''IT'S GONNA BE ME'', etc.But this group broke up when Justine left the band.RONAN KEATING was the lead vocalist of the famous Irish boy band BOY ZONE,this band gave many all time hits songs like "SMILE","I NEEDED YOU,"NO MATTER WHAT","FATHER AND SON" etc.But RONAN KEATING left the group for his solo carrier.Though BOY ZONE reunite two years ago.There was another very famous Boyband named SAVAGE GARDEN,this band gave many hit tracks like "CRUSH AND BURN","THE ANIMAL  SONG","I KNEW I LOVED YOU" etc.But when the lead Vocalist of this band  DARREN HAYES left the band it's broke up.This way many famous band broke up when they wearing thorn of popularity.They broke their band for solo carrier but have no idea that they also broke thousands of  heart of their diehard fan.