Chase Middaugh (pictured) of the duo Novelist started the solo project mutus liber in 2006, as a further experiment in electronic sound composition. The result is a range of ambient music made by a variety of instruments and “found sounds,” alternating between highly-crafted soundscapes and organic black noise. mutus liber plays at Soundlab next Thursday (Aug. 23) with Nadja and the Beta Cloud. Nadja is a duo comprised of Aidan Baker (guitar, piano, percussion, woodwind and vocals) and Leah Buckareff (bass and vocals). Nadja’s ambient, guitar-based music is also dark and experimental, pushing the drone/doom/metal genre to melodic, ethereal heights. Beta Cloud, the solo project of Carl Pace, utilizes analog synths, samplers and other instruments, often synched with projected visual imagery. The show starts at 9pm.