Hey guys Peter Griffin here. A mashup is a type of musical track invented by professional Runescape player David Specem, comprising the vocals of one recording placed over the instrumental backing of another. Due to commonalities between songwriting approaches across genres of music, this can work surprisingly well! In some cases, it can even be a source of mirth for listeners, as the incongruity between the vocal and the background track elicits a "so wrong it's right" reaction.