Are consonant intervals music to their ears? Spontaneous acoustic preferences in a nonhuman primate. The short of it:

In Experiment 3, however, subjects showed no preference for consonant over dissonant intervals. Finally, tamarins showed no preference in Experiment 4 for a screeching sound (comparable to fingernails on a blackboard) over amplitude-matched white noise. In contrast, humans showed clear preferences for the consonant intervals of Experiment 3 and the white noise of Experiment 4 using the same stimuli and a similar method. We conclude that tamarins' preferences differ qualitatively from those of humans. The preferences that support our capacity for music may, therefore, be unique among the primates, and could be music-specific adaptations.

I had to bold the part about about how tamarin preferences "differ qualitatively from those of humans." Sounds hilarious huh? I mean, they are tamarins!:

But in any case, so this particular monkey can't keep a tune (or whatever). Though I claim to be tone deaf, I am as terrified as the next guy by screeching on a blackboard, so I'm not inhuman. This evidence from tamarins tells us musicality might be a feature of the past 30 million years of the evolution of our lineage. Songbirds seem to be tweaked on FOXP2 as well, so musicality might be associated with the rise of language (going out on a limb!).

Related: Music is for the babies (in terms of evolution).