What's the community's consensus on using MIDI versions of popular music?

[Szuran]

There are some cool MIDI versions of popular tunes, like Iron Maiden songs. What would you think about using them in WADs? Since they are for non-commercial use, and MIDIs themselves aren't much different from cover versions of songs, I guess it's legal. But how do you see it? What's your opinion?

[Walter confetti]

I think the same way on the legality of midi files, they could be used easily (almost) without any problem... Expect If try to use them on YouTube videos.... I had some little problem with a map from cbspeed.wad that uses the Blade Runner theme...

 

For me it's Ok to use them in your wads, until they sounds good and fit with your map...

[Jon]

I probably first heard NIN in MUS format in PWADs.