If you're looking for manga similar to Forest of Piano 2nd Season, you might like these titles.
The Koizumi siblings have a father who is a professional violinist and a mother who is a professional pianist. Unlike her older brothers who have musical talent like their parents, Karin is a poor student at her music high school. She is proud of her twin brother Kazune, who is beginning to follow their father's footsteps into the professional violin world, but every so often, the seeming gap between them depresses her. This is a heartwarming story about the Koizumi family who love and support each other through tough times.
Aono Hajime was a prodigy violinist until he grew jaded with playing the violin due to personal reasons. Now in his third year of middle school, he struggles to decide his academic path. One day in school, he meets Akine Ritsuko, a hotheaded novice violinist who wants to enroll in a high school with a distinguished orchestra club. When he finds himself getting closer to Ritsuko and being brought back to the world of violinists, time starts moving again for him.
Kuon Otogami was a genius pianist whose name is among the greatest in the annals of the music world. He had seven children who also all became genius pianists. All seven except for the one named Lucky that is. This is the miraculous story of a regular kid taking on godly talent!
Lima was born in the family of musicians; her mother a worldwide opera diva and her father a famous violinist. Lima’s dream of becoming a professional violinist, like her father before his death, was shattered after the car accident. But faith brought her to the world of opera… and to eventually become a famous diva, and face up to her mother, whom has never shown her love towards her daughter…
Boy meets Girl!! Kazuo, a ronin aiming to get into a distinguished college of music, meets a girl who loves baseball. Her name is Uta Naruse, the piano prodigy who can play Debussy as if it were nothing! Manga may be a soundless way of storytelling, but your heart will be filled with beautiful music!!
Tezuka Ayane was aiming to become a pianist. She was also working as a part-time home-tutor when she met Narumiya Kou. She found herself falling for him, but there was a difference in their ages and her feelings didn't seem to be returned. Six years have passed since then and Ayane is a music teacher in an all-girls school. One day, she goes to a jazz-piano audition and meets Kou there..!