This is music BS actually, but perhaps just a tiny bit more music than BS:

EVOLUTION OF BIRD SONG AFFECTS SIGNAL EFFICACY: AN EXPERIMENTAL TEST USING HISTORICAL AND CURRENT SIGNALS

Making use of historical recordings of bird song, I found that both male and female white-crowned sparrows (Zonotrichia leucophrys) respond more strongly to current than to historical songs, indicating that historical songs are less effective as signals in the current contexts of both mate choice and male–male competition.

On the one hand: That may explain (if we transfer the result to humans) why being able to sing 36 verses of Tamlyn wins you less female admirers than being able to sing a Robbie Williams song.

On the other hand: That single female admirer that still sits looking at you after the 36th verse of Tamlyn may be a better choice for a male folkie than the many others who have left during the rendition.

Wolfgang