a specific lexical gap

[Danno]

so, for those who don't know, a lexical gap is a concept that doesn't necessarily have a clear specific word describing it in a given language. 

i've been thinking lately that some of our favorite (sub)genres of music have this.  while most Youtube musicians do covers of popular music or create original content, there are a number of videos out there featuring songs adapted from existing music.  these tend to be called parodies, and maybe a number of them are effectively, i'd have to talk to the artists responsible... a number, while hardly a tribute to the original song/artist, aren't really making fun of them either, though.  am i being too nerdy, or do you think we need a better way to talk about these songs that specifically talks to the fact that they are an adaptation with no strong judgement about their source melody (and sometimes lyrics?)

[Abreo]

Parodies really seem to have been popularized by Weird Al who was very respectful to the artists who wrote the songs he parodied. Parodies really seem to rarely be vicious, if anything we need a different word for vicious parodies. 

[Cary]

Depending on their subject matter and style they may be classified as filk  music or another fan genre.

http://en.wikipedia.org/wiki/Filk_music