Symphony No. 1 in D major "Titan"
Symphony No. 6 in A minor "Tragic"
Symphony No. 5
Symphony No. 9
Symphony No. 2 in C minor "Resurrection"
Symphony No. 7 "Song of the Night"
Symphony No. 8 in E-flat major "Symphony of a Thousand"
Symphony No. 3 in D minor
Symphony No. 4 in G major
Best Song Cycles
Das Lied von der Erde (The Song of the Earth)
Des Knaben Wunderhorn (The Boy's Magic Horn)
Kindertotenlieder (Songs on the Death of Children)
We highly recommend to buy the great version of Mahler's symphonies, with all symphonies by Beethoven, Tchaikovsky, Sibelius, Schumann, Brahms, Bernstein, and some other symphonies, conducted by Leonard Bernstein:
Leonard Bernstein: The Symphony Edition
The same version of Mahler's symphonies with Kindertotenlieder from New York Philharmonic Orchestra conducted by the great Leonard Bernstein: