How about extending Every Noise at Once to bird song? Recent research indicates that multi-species bird communities
cluster their songs. Data from the study is <a href="http://www.pnas.org/lookup/suppl/doi:10.1073/pnas.1314337111/-/DCSupplemental/sd01.xls">available here</a>.
You could at least award a bird the distinguished honor of being "most metallic" (having song most similar to the most popular metal songs).