Simon Harry Piers Jeffes (19 February 1949 – 11 December 1997) was an English classically trained guitarist, composer and arranger.

He was the composer of the ballet Still Life at the Penguin Cafe, of the much-recorded piece Music For A Found Harmonium, and other music recorded by the Penguin Cafe Orchestra.

He is also known for assisting Sex Pistols producer Bill Price with the string arrangement for the Sid Vicious version of "My Way" which reached #7 on the UK singles charts as part of The Great Rock 'n' Roll Swindle soundtrack.

Jeffes died of an inoperable brain tumor on 11 December 1997 in Taunton, leading to the dissolution of the Penguin Cafe Orchestra.

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