Simple & Sweet:
* A treble clef: A classic and instantly recognizable symbol of music.
* A musical note or staff: Simple, but effective.
* A musical instrument: Choose their favorite instrument, or one they frequently teach. A simple outline is fine.
* A heart with a musical note inside: A cute and heartfelt option.
* "Thank you" with musical notes surrounding it: A personalized touch.
More Detailed (if you're more skilled):
* A portrait of the teacher (if you're confident): A challenging but rewarding option if you're skilled at portraiture.
* A scene of a music class: Draw the teacher with students, engaged in a lesson.
* A specific piece of sheet music: If you know their favorite song or a piece they often teach, a portion of the sheet music would be a thoughtful gift.
* A stylized illustration of their favorite instrument: Go beyond a simple outline and add detail and color.
* A collage of musical instruments: Combine various instruments in a visually appealing way.
Considerations:
* Their instrument of expertise: A drawing related to their primary instrument (piano, violin, guitar, etc.) would be especially meaningful.
* Their teaching style: If they are known for being energetic and fun, a more vibrant and playful drawing might be suitable. If they are more reserved and classical, a more elegant and detailed piece might be better.
* Your own skill level: Don't try to do something too complex if you're not comfortable with it. A simple, heartfelt drawing is always appreciated more than a rushed or poorly executed complex one.
Remember to add a personal touch! A handwritten note expressing your appreciation for their teaching will make any drawing even more meaningful.