I'm in a band that's still in the start up stage but due to the very thick arrangements with synths and electronics, it seems pretty clear that we will need to perform with backing tracks. Right now in practice, the drummer uses a very long headphone extension to reach the PC the singer/guitarist controls. For many of these songs, it makes sense that I too have a click in my ear because they are bass driven or start with only bass and backing tracks leaving me quite exposed without a click. The long term goal is to add another guitarist and maybe they'll want a click as well. So the question is, what are some systems that you have used or would recommend for sending click and back tracks to multiple receivers that I, the drummer and potentially two more musicians would listen in on?