I couldn’t possibly pick my favourite composer as this changes on a monthly basis depending on what I am currently listening to and playing. I could, however, say that I think JS Bach is perhaps the greatest composer of all time.
“Over 250 years after his death,” writes the Catalan musician and conductor Jordi Savall, “the mysterious current of Bach’s genius continues to transport us to the depths of the human spirit. [His music] provides the inexhaustible impulse for a spiritual and aesthetic journey into those sublime realms where the human and the divine communicate and are sometimes united in harmony.” His music is revered for it’s intellectual depth, technical command and artistic beauty. He composed some of the most technically challenging and difficult music to be found in any pianist’s repertoire. An ability to play Bach well separates the men from the boys!
Have a watch of this documentary and decide for yourself if he really is the greatest composer of all time:
Also have a look at the excellent Beethoven and Mozart BBC Documentaries.