Obviously (~obviously~) this is all a branch of biology, specifically related to hearing mechanisms, so I may need to bluff a bit.
(You see, because our perception of consonance is related to "spectral roughness" which is related to masking on the basilar membrane, so other alien species would hear consonance differently if they had different basilar membranes or entirely different ways to perceiving sound. So, like, what are ways that fish and bugs hear things and how is masking different and I'll, uh, postulate about what their rules of harmony might be if they followed a convergent evolution to how western music has behaved since the invention of equal temperament.)
Robots detect pitch with autocorrelation, so don't experience spectral roughness, but do get confused based on their window sizes. To a robot, any two paired sounds are either perfectly consonant, or perfect unisons. To be a robot is to live in a state of perfect harmony.
Pitch is therefore meaningless to them as musical material. Because everything is harmonious, everything is bland. Tune is nothing to them. Robot music is based entirely on rhythm.