#1
I just got an acoustic (I already was playing electric) and want to learn a good classical song with a wah wah.
#2
How about Moonlight sonata? Or are you talking about classic rock?

Stu Hamm does a pretty sweet version on the bass.

https://www.youtube.com/watch?v=H8Q_J2fIKPI

You could really use a wah with just about any song, classical or otherwise.
Paul Reed Smith CE-24 2005 and Santana SE with Seymour Duncan pickups.
Line 6 Amplifiers
Boss Effects and Steve Vai's Wah Pedal
Dunlop Picks and Elixir Strings .48


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https://www.guitarchalk.com