Title says it all. I love using VN BGM while I work since it's designed to be background accompaniment, makes it easier to stay on task. Here's some of my favorites over the years:

• [KiraKira] Track 19 - Probably my #1 favorite.
• [KS] Red Velvet - Never gets old.
• [Deardrops] Feeling Heart - Very similar to track 19, wonder why.
• [Saya] Song of Saya II - Between this and Schizophrenia the music did a better job for the atmosphere in this VN than I ever could have imagined. Brilliant sound design.
• [Fault Milestone] Galavanize! - Shockingly good BGM for the smaller-scale project this was.
• [Kikokugai] Acid Rain - Whatever you may think about the story you ain't got shit on this one.
• [Dengeki Stryker] Prism - Turns out I just really like Overdrive BGM.
• [Fata Morgana] The Entire Fucking OST - Because just one song doesn't do it justice.
• [BokuTen] I'd put one here but MangaGamer kinda wants to push sales of the OST, so I'll just list Maze and Brand New Day.
• [Himawari] Ambient 48 - Short, sweet, and my current ringtone.
• [Himawari] Daylight - Big Grisaia/Overdrive vibes on this one.
• [S;G] Gate of Steiner - Hard to not love the main theme.
• [Grisaia] The Full Kajitsu BGM - Because fuck it it's all great.

Be sure to identify the source VN, and link away!