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。
重要作品 鄉村花園(Country Gardens) Irish Tune from County Derry Lincolnshire Posy 1. Dublin Bay (Lisbon) (Sailor's Song) 2. Horkstow Grange (The Miser and His Man: A Local Tragedy) 3. Rufford Park Poachers (Poaching Song) 4. The Brisk Young Sailor (Who Returned to Wed His True Love) 5. Lord Melbourne (War Song) 6. The Lost Lady Found (Dance Song) 河邊茉莉(Molly on the Shore) Hill Song No. 1 Hill Song No. 2 殖民地之歌(Colonial Song) 擬莫里斯舞曲(Mock Morris) Songs of the North Leezie Lindsay Bonnie George Campbell Drowned Willie's Gane To Melville Castle Train Music (fragment for orchestra)
曲目
(01-04) In a Nutshell Suite: (05)Train Music (06)Country Gardens: English Morris Dance Tune (07)Ravel, arr. Grainger - La Vallée des cloches (Miroir) (08-13) Lincolnshire Posy for military band (14)Debussy, arr. Grainger - Pagodes (Estampes) (15)The Warriors: Music to an imaginary ballet for orchestra and three pianos
City of Birmingham Symphony Orchestra Simon Rattle, conductor