So Mac OSX has the say command, which reads out some text in the computers voice synthesis functionality. This is old news.

The new hotness is switching into the “cello” voice with say -v cello. I’s lyrical and beautiful, though reading out file names is entertaining:

say -v cello source/_posts/2013-08-24-cello-voice.markdown

This was brought to my attention through the guard-shell gem README.