Manic Keyboard Player -- I Want to Land a Gig at Disney! (VIDEO)

Anna Eberhart, the keyboardist whose insane performance caused her band's video to go viral, wants to take her enthusiasm to the Happiest Place on Earth.

The 17-year-old who plays for the Boston Crusaders Drum and Bugle Corps tells TMZ ... she's hoping if anything comes out of the clip -- which has reached over 3 million views this past weekend -- she's crossing her fingers for a role as a Disney princess ... specifically, Rapunzel.

Check out the vid, Anna explains why she was mean-mugging so hard and it's a classic. Seriously. Like ... a literary classic.