Linus.

Linus (Λῖνος ) (Linos) had connections with lyric in Greek mythology. There are stories about this character.

His father was Apollo and his mother was Muse.

Linus visited different places and met with other characters.

He was killed by Heracles.

Urania.

Urania (Οὐρανία) (Ouranía) was the Muse of astronomy in Greek mythology. The globe was the symbol of this goddess.

Zeus was her father and Mnemosyne was Urania's mother.

Also, she had several siblings: Polyhymnia, Euterpe, Calliope, Clio, Erato, Thalia, and etc.

Apollo (Ἀπόλλων) (Apollōn), Hermes (Ἑρμῆς), and Amphimarus (Ἀμφίμαρος) were Urania's husbands.

Linus (Λῖνος) (Linos) and Hymen (Ὑμήν) (Humḗn) were their sons.

Euterpe.

Euterpe (Εὐτέρπη) was the Muse of lyric poetry in Greek mythology. Double flute was her symbol.

Zeus was Euterpe's father and Titaness Mnemosyne was her mother.

Euterpe had several sisters: Calliope, Clio, Polyhymnia, Urania, Erato, Thalia, Terpsichore, and Melpomene.

Strymon (Στρυμών) and Apollo were her consorts. Rhesus (Ῥῆσος) (Rhêsos) and Orpheus were Euterpe's sons.