I'm working on a project that needs to be really elegant, light and understated. I've chosen Cormorant Garamond Light Italic + Proza Libre. I'm looking for a third font to go with this and had Tenor Sans as an idea to complement the calligraphic feel of the other two fonts. But Tenor Sans is too solid. Do you have any other ideas these two fonts could go with? 

Cormorant Garamond Light Italic + Proza Libre + ?

Thanks

Having some more information about the scope and constrains of the project would very much help.

Anyway, given the selection you present, you could consider Lato, that presents a subtle stroke modulation in its lighter weights.

Thanks a lot Riccardo! Lato is a good option.

It's a third font that can be used for call-outs. This font should display well on web and in print. I need a licence for commercial work and this shouldn't break the bank, ideally be a free font, but not necessarily. Is that the information you were looking for?