自由音樂(Free Music)是葛人傑11、12歲時,看到Albert Park Lake的水紋而激發的構想,到晚年時才逐漸實現。自由音樂強調節奏、調性的自由度,並重是旋律性。葛人傑甚至使用一些機器,以產生出過去器樂演奏的民謠無法達到的流動感。在出版音樂前,葛人傑也會先用這些儀器聽過。在這些機器中,最有名的儀器叫作"Hills and Dales",在之後葛人傑的儀器製造技術也越來越成熟,亦有使用光電池和電晶體。
葛人傑的「自由音樂機器」是現代電子合成器(Electric Synthesizer)的先驅。
曲目
CD1:
1.Suite 'In a Nutshell': I. Arrival Platform Humlet 2.Suite 'In a Nutshell': II. Gay but Wistful 3.Suite 'In a Nutshell': III. Pastoral 4.Suite 'In a Nutshell': IV. The Gum-Suckers' March 5.The Immovable Do (The Cyphering C) 6.In Dahomey 7.Walking Tune 8.Spoon River 9.My Robin is to the Greenwood Gone 10.The Hunter in His Career 11.Hard-Hearted Barb’ra (H)ellen 12.Eastern Intermezzo 13.Children’s March 'Over the Hills and Far Away' 14.Mock Morris
CD2:
1.Peace – Saxon Twiplay 2.Scotch Strathspey and Reel 3.Three Scotch Folksongs 4.Sailor's Song 5.Blithe Bells [Bach] 6.Cradle Song (Wiegenlied) [Brahms] 7.Hornpipe [Handel] 8.Ramble on the Last Love-Duet in Richard Strauss' Opera 'The Rose-Bearer' 9.The Man I Love [Gershwin] 10.Love Walked In [Gershwin] 11.Nell [Fauré] 12.Après un rêve [Fauré] 13.Now, O Now, I Needs Must Part [Dowland]