I love Mahler No.1.  The second movement is such an amazingly happy dance suite.  I smile when listening to it.

The second movement is a modified minuet and trio. Mahler replaces the minuet with a Ländler, a 3/4 dance-form that was a precursor to the Austrian waltz. This is a popular structure in Mahler’s other symphonies, as well as Franz Schubert’s. One main theme repeats throughout the Ländler, and it gathers energy towards a hectic finish. The main melody outlines an A major chord: 
  \relative c' { \clef treble \time 3/4 \key a \major \partial 4*1 e8-. r | a r r \autoBeamOff cis e, r | a4~ a8 r r e | a r \autoBeamOn a-.[ b-.] cis-.[ d-.] | e4~ e8 }
The trio contains contrasting lyrical material.