Is it a list of the top 100 SONGS or the top 100 PERFORMANCES of songs? I don't think these people---who seem to be more like groupies---at MOJO understand the difference. They do a disservice to the "songwriters" they supposedly "invited" to participate.
IF it is the SONG that is voted on, then it has nothing to do with the performer---original, "definitive," or whatever, but rather credit goes to the SONGWRITER(s). If it is the top 100 songs of all time as performed or whatever (however they wish to describe it), then just say so, and they shouldn't mix in "songwriter" at all in the mix. Like most people, they don't seem to understand that the creative process of the creation of the song is different than the person singing and performing the song. Even with the ubiquitous singer-songwriter of the rock-era, the song is only written once, though then performed eternally (or maybe, in the case of much rock music, it just SEEMS that way.) The song exists external to the singer's performance of the song. Hence, many or most of the great songwriters toil in anonymity, but that is ok with them. (example: does anyone at Mojo know---or care---who WROTE "Over The Rainbow"? I'd BET that if you took a poll at Mojo it would be like asking the blondes questions on Howard Stern......I bet most would say, oh, Judy Garland wrote it. BTW...the ans is E. Y Harburg and Harold Arlen wrote "Over The Rainbow.")