-to coat, treat, or combine something with metal
. In other words, the result of remixing or remaking a song/theme into a heavy metal song. The song or theme beforehand can be practically anything, if it's not a metal song to begin with (you would just be doing a cover then)
Metalizing includes but is not limited to:
-Heavy distorted guitars and bass for the rhythm
-A lead guitar that follows the scale the melody in the song
-A drum rhythm that fits with the song
-A keyboard or synthesizer added for a classic feel.
Theme songs from classic video games are very popular to metalize.
I metalized the all the theme songs in Super Smash Bros Brawl.