Lots of composers are at it! Taking the audio files of unusual sounds and manipulating and processing them (using computer software) to produce new and distinctively different-sounding music.
I first became aware of this as a digital composing technique in the songs of Imogen Heap (in her album ‘Sparks’). For example, in the track ‘Telemiscommunications‘, we hear a series of pops, pings and clicks which are structured by some beautiful piano chords and evolving drones. In ‘The Listening Chair‘, all the sounds come from her voice, from which she creates rhythms, pitch slides, reversed sounds and echo effects. In the track ‘Lifeline‘ she invited fans to send her audio clips to incorporate, and includes the heartbeat of a baby in the womb and a slinky going down some stairs.
Composer Hildur Guðnadóttir created the entire score for the HBO mini-series ‘Chernobyl’  by using the sounds she and her team recorded in a power plant in Lithuania. In it we hear highly processed sounds that contain both rhythm and pitch.
‘Planet Earth II’ composers Jasha Klebe and Jacob Shea had access to the natural sounds that the directors had been recording in the wild, incorporating them into the score in a way that ‘blurred the lines between what were natural sounds and what was music’ . Wind sounds from the tops of mountain were shaped into pitches and incorporated into the score for the ‘Mountains’ episode, rustling grass from was turned into a percussion instrument for the ‘Grasslands’, and the sound of swarming locusts made it into the score for ‘Deserts’.
Christian Henson shows how to process the sound of rain to create pitched, fantastic ethereal sounds. 
I wanted a go: so I took, as my source audio, the clacketty sound you get when slamming fingers down on the flute (without blowing).
I then copied it twice, to create three tracks, and put different effects on each track: such as EQ, compression, pitch shift, tremolo, stereo delay, and distortion (guitar amp), later adding reversed celesta, with tremolo and high pass filter to capture the ticking sound (I’m using Logic Pro X).
Digital Audio Workstations – fun toys to play with!