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: The trio contains contrasting lyrical material.