A walkthrough of the ZX Spectrum game, Deus Ex Machina. This game came with an audio soundtrack, designed to play in sync with it, and it's included in this video. Some notes from the submitter of the video, Albert Valls:-
"Both the game and the sound have been synched as much as originally planned with the 1984 release, having in mind all the scenes and text included in this work, the clues the 30th Anniversary Edition of the game gave where necessary, and also a couple advices by Mel Croucher himself while talking about DEM some time ago. The soundtrack has been directly taken from the CD release so it should be considered close to lossless audio quality. Enjoy... and keep smiling. :-)" .
Recorded using "rollback", a feature of the emulator which allows you to mark a point, which you can then roll back to later if you get in trouble, and try again. More info. on the channel "About" page: https://www.youtube.com/user/rzxarchive/about