"ear", not "air"
1. OK, "pleasant to the ear"
2. OK. There is no direct object. "Music that pleases (to the ear)"
3. OK
4. NO. The music is pleasant. The ear is not pleasant
5. NO. The ear is not "pleasant".
6. NO. It is the music, not the ear, that pleases.
7. Acceptable in a poetic way.
8. NO. The ear is not "pleasant". Instead, "to the ear", and omit "to hear".
9. No. Ears are not pleasant.
10. Acceptable in a poetic way.
11. No. Ears don't select. Ears are pleased, not "pleasant".