It is Liszt's "Hungarian Rhapsody No. 2"
The symphony in the concert hall is Johann Strauss's opera "Bat"
"The Flying Cat" "The interlude in that episode is Chopin's "Grand Waltz"
The interlude in the ice skating episode is "Waltz" from Tchaikovsky's "Sleeping Beauty"
There is also The Cat Above and The Mouse Belowlt; Enemy Road is Narrow; in it Tom sings the aria "Make way for the busy man" from Rossini's opera "The Barber of Seville"