For example: if my friend who works on self-driving software for Google is at my house, should I just be able to download the source code from his work laptop onto a USB drive? The software distribution cost, like music, is near zero, so is this ok? If not, how is this example different than music?
I, for one, don't believe it is "absurd" that creators like musicians or Google be able to exert some control over how their creations are copied for a limited period of time. Currently the copyright system has run amuck and become far too creator-centric, but I think the basic idea is sound and makes a nice set of tradeoffs.
I also disagree that history somehow makes it obvious that incentives are not needed to make music. When the printing press came along and drastically reduced that cost of distributing music, copyright systems followed almost immediately thereafter. What historical precedent of an environment with low cost distribution but without copyright systems makes it obvious that the copyright part is unnecessary?