Goosebumps (1995)

S1E8 Piano Lessons Can Be Murder

While exploring the attic of his new home, Jerry stumbles upon a neglected old piano. His parents suggest he take lessons, which initially excites him. However, there's an unsettling vibe surrounding his piano instructor, Dr. Shreek, that Jerry can't quite identify. Soon, he learns chilling tales about the music school where Dr. Shreek teaches—stories of students who attended their lessons but mysteriously vanished, never to return.