It's a rarity that bands lose key members, but still have big success.  Just ask Little Texas and Lonestar.  But the exception to the rule was Restless Heart.  They had many big hits in the 80's and early 90's before lead singer, Larry Stewart pursued a solo career.  It was only after that, the band had what many would consider their signature song and their biggest crossover hit, "When She Cries."  I chose it for that reason...and for the sweet mustache on drummer and lead singer, John Dittrich.