Diurne #1 is a 7 hours long sound synthesis composition. Incorporating tide level predictions of the river Thames in London, it was performed live for RTM.FM at TACO! (Twang Achooclang Oooff!) on 6th November 2018. It began at a predicted Thamesmead area high tide level at 12:17 and ended at a predicted low tide level at 19:05. As tides are one of the slowest waveforms affecting the earth daily, the composition was programmed to be performed as slowly as possible on custom made synthesisers. The title of the piece, Diurnes translates as daytime in French, and denotes the gravitational pull of the moon (semi-diurnal) on the earth’s body of water, which produces tide phenomena. Additionally, the title is an inversion of the compositional style of a Nocturne in music and painting, the latter of which was famously titled by James McNeil Whistler for a series of pantings depicting the river Thames at night.