The jamLink from MusicianLink allows musicians to play together from different locations via high-speed internet. Below we see two performers onsite at NAMM jamming with a guitarist in Plano, Texas, which was 1438 miles (2312 km) away:

(Can you spot the obligatory cat in this picture?)

The performance was relatively tight, though one could hear a slight bit of delay or hesitation on the first beat of some measures.

I have actually had a chance to glimpse the jamLink during its development, and would like to use it in the future. At the moment, however, it is doubtful that the network service at CatSynth HQ is up to the task.