It turns out that some LCD monitors will emit a tone when patterns of repeating bars are displayed on the screen. This pattern varies based on the size of the bars. The goal of this project is to eventually be able to play some music through the screen using a web page.I found out about this effect from the Hacker News comments on a page that was about a completely different bar spacing effect but produced sound out of some monitors (including my external Samsung LCD). Some commenters produced theories including that this is caused by the expansion and contraction of capacitors/inductors in the display as the screen scans down and the black pixels take a different amount of power than the white pixels. This theory suggests that varying the width of the bars would change the pitch, which indeed does happen.