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.

Polyhymnia.

Polyhymnia (Πολυύμνια) was the Muse of poetry and dance in Greek mythology.

Zeus was her father and Mnemosyne (Μνημοσύνη) was her mother.

Calliope (Καλλιόπη) (Kalliópē), Urania (Οὐρανία) (Ouranía), Clio (Κλειώ), Euterpe (Εὐτέρπη), Erato (Ἐρατώ), Terpsichore (Τερψιχόρη), Thalia (Θάλεια), and Melpomene (Μελπομένη) (Melpoménē) were Polyhymnia's siblings.

Orpheus (Ὀρφεύς) and Triptolemus (Τριπτόλεμος) (Triptólemos) were her sons.

There are different arts about Polyhymnia.

Hyacinth.

 Hyacinth (Ὑάκινθος) (Huákinthos) was a hero in Greek mythology. He was popular in Sparta.

Oebalus (Οἴβαλος), king of Sparta, was Hyacinth's father. Or his father was Pierus (Πίερος). His mother was Clio (Κλειώ) or Diomedes (Διομήδη).

Hyacinth was a very beautiful prince. He was admired by Zephyrus, west wind. Also, Hyacinth had relationships with Apollo (Ἀπόλλων).

Spartan prince was killed by Apollo. He accidentally hit Hyacinth with a discus.

There is a plant named Hyacinth.

Source of image:

https://www.shutterstock.com/es/image-illustration/violet-flowering-hyacinth-watercolor-flower-1261793959