Teaz

They have taken residence in my head.

Can you find the instrument hidden in these short brain teasers? The answers are down below, and no, I won't judge you if you go to the end of this post and cheat due to utter frustration.
1. P O

2. BA BA

3. ECLART

4. @ # $ %

Highlight below this line:
1. Piano (P and O)
2. Tuba (Two BA)
3. Clarinet (CLAR in ET)
4. Cymbals (Symbols)