How do you tune vibraphone keys?

the key is "vinyl" its on their facebook page

with a chromatic tuner, they pop up letters and with the help of wikipedia you have access to close to 100 tunings plus you could even make your own tunings up like I do.

The lowest string on a viola is the C string, and it is also the thickest string. Tune it to the C key below middle C on the piano. The next thickest string is the G string, which is tuned to the...

A key?

Bb. an acoustic guitar can play in any key, like a piano.