Right again. Obviously, the use of the Ride of the Valkyries in the bunny sequence is a reference to
this.
(Why the spoiler tags?)
The list:
1.
2.
3.
4.
5.
6.
7.
Day of the Tentacle, Introduction — Original: G. Rossini,
William Tell, Overture [Trunkyo]
8.
9.
10.
11.
12.
The Last Express, Anna's concert — Original: C. Franck,
Sonata for Violin and Piano in A Major [Fien]
13.
14.
15.
16.
17.
18.
19.
20.
Full Throttle, Attack of the bunnies — Original: R. Wagner,
The Valkyrie, Ride of the Valkyries [Trunkyo]