English morphological rules detail how words relate to other words. Thus, my best assumption would be because BOLDEST is an adjective whereas BOLDLY is an adverb.
1. George Gershwin primarily composed classical and jazz music. 2. Beethoven became partially deaf towards the end of his life. 3. The harpsichord is a version of the piano. It was smaller and had a more tinny sound. It was primarily featured in the classical era. 4. The piano was invented in the year 1655 and was primarily featured in the classical era. 5. Idk sorry :( 6. Idk sorry. :( 7. Mozart 8. Classical I think 9. Idk sorry :( 10. 11. 12. 13. I don’t know
