Horenstein is particularly remembered for championing modern music (in 1929 he conducted the premiere of the arrangement for strings of three movements of Alban Berg's Lyric Suite), and for his advocacy of the works of Anton Bruckner and Gustav Mahler at a time when both composers were very unfashionable.
Example Usage of Horenstein
CornoDiBassetto: @nightafternight Horenstein/LSO. Finale always gives me goosebumps. (via @mahlerfan2)