... May well be Leslie Howard's prodigious pianistic achievement, recordings of the complete works for solo piano of Franz Liszt. Liszt, a great admirer and promoter of many other composers and their works, transcribed many of his favourite works for piano, including many works originally composed for operas. For those familiar with the original works, hearing the Lizst transcriptions may enable one to hear the original works afresh, and to gain a renewed appreciation for the genius of Lizst, and his titanic contribution to pianistic literature. For those unfamiliar with either Lizst's works or those pieces he transcribed, these recordings afford a window on an entire universe of music: one can listen to a recording of a Lizst transcription, and be led on to realms of music discoveries.
As an example of one such transcription, here is Leslie Howard's recording of the transcription of the Overture for Les Francs-Juges, an opera Berlioz abandoned: