My daughter plays keyboard. She does not take any lessons but likes to develop her skills on her own. Is she allowed to play on Sefira, mainly to continue developing her skills? (She obviously enjoys the process, or else she would not be doing it).
Practicing to play an instrument as a hobby during Sefirah is not allowed unless one is practicing for playing that he does for his Parnassah, because then this is not considered Simcha.
If it’s not a complete song just bits and pieces, its fine.
Igros Moshe, Orach Chaim Chelek 3, Siman 87. Mishnas Hagrish Pesach p. 190.