Being cooped up in a bus with the same people 365 days a year is bound to cause tension. Add in the fact that life-altering decisions have to be made collectively, but the consequences of which take places individually. So it's absolutely no wonder ... or fault of anyone involved ... that from time to time members have to bid farewell to their musical families and take separate paths.

Everyone remembers that Sugarland was originally a trio, with Kristen Hall exiting after only one single, and Heidi Newfield's very public departure from Trick Pony cohorts Keith Burns and Ira Dean to pursue a solo career, but you may not be able to guess which Rock and Roll Hall-of-Famer was an original member of a certain legendary country group.

Scroll through the gallery below for a flashback to the bands as they once were...