1. I don't know - it simply sounds like an orchestral version of No. 2
2. 'We're going to Maxim's' from The Merry Widow of Lehar
3. The Bartok Two Piano and Percussion Sonata
4. Fourth movement of Bartok's Concerto for Orchestra
5. The same theme in inversion but I don't know who wrote this version.
Oh, I think I just remembered what No. 1 is. Isn't it from Shostakovich's
Fifth Symphony, a satirical quotation of the Lehar?