Some early myths counted three of them including Melete and Aoede and it was not until later that they were worshipped solely at their sacred home of Mt. Helicon.  
Born at a site called Pieria at the foot of Mt. Olympus, they were raised by their nurse Eupheme [YOO-fuh-mee] and her son, Crotus the hunter.  Otus and Ephialtes were the first to sacrifice to them.  Some early myths counted three of them including Melete and Aoede and it was not until later that they were worshipped solely at their sacred home of Mt. Helicon.  Their mother was the goddess of memory, Mnemosyne [neh-MOZ-uh-nee].  FTP, name these daughters of Zeus who preside over various arts and sciences.
Born at a site called Pieria at the foot of Mt. Olympus, they were raised by their nurse Eupheme [YOO-fuh-mee] and her son, Crotus the hunter.  
Muses