Bgsound (Website BGM)

bgsound is an old internet feature that was used to play midi files in the background when exploring a website that supported it.

Using html, the tag, this allows a .mid file to play automatically upon loading the webpage.

Using different attributes, the midi file's playback can be effected, such as balance, looping, volume, etc.

However, over time, many browsers discouraged the use of bgmusic, with only IE being the only browser to still support bgsound. Sadly, IE eventually dropped the support of bgmusic.

Presently, by going into old websites that once used bgsound, it will have different effects: By loading up the Developer Tool in Chrome on an old 90s archive.org website, if is one of the strings in the code, that means the website once used bgsound.
 * Internet Explorer automatically opens up Windows Media Player
 * Google Chrome automatically download the midi file into the Downloads folder
 * Opera automatically download the midi file into the Downloads folder
 * Firefox has not been tested, but it most likely will automatically download the midi file into the Downloads folder

The Website BGM Midis category lists midi files that once played as BGMs on older websites.

Videos
The Lost Art of MIDI – Bringing BGSOUND Back to the Web - Feross Aboukhadijeh (JSConf Colombia 2018): https://www.youtube.com/watch?v=-DyCsY0vcxM