, ▁Cost ello ▁and ▁Ant ol ick ▁decided ▁to ▁expand ▁the ▁band , ▁with ▁the ▁purposes ▁of ▁live ▁performance ▁and ▁adding ▁more ▁outside ▁influ ences ▁to ▁their ▁established ▁sound . ▁ ▁After ▁some ▁trial ▁and ▁error , ▁the ▁band ▁solid ified ▁their ▁ro ster ▁to ▁include ▁keyboard ist ▁Tim ▁C ock ing , ▁lead ▁guitar ist ▁Greg ▁Will son , ▁backup ▁vocal ist ▁Mel issa ▁Re yes , ▁and ▁bass ist ▁Jer emy ▁Sie gel . ▁ ▁All ▁of ▁the ▁members ▁of ▁The ▁O aks ▁are ▁multi - inst rument al ists . ▁ ▁During ▁a ▁typical ▁O aks ▁show ▁you ▁are ▁likely ▁to ▁see : ▁ ▁Re yes ▁playing ▁per cussion ▁and ▁keys ; ▁Ant ol ick ▁playing ▁various ▁per cussion ▁instruments ▁and ▁keys ; ▁C ock ing ▁playing ▁accord ion , ▁tr ump et ▁and ▁keys ; ▁Sie gel ▁playing ▁trom bone , ▁per cussion , ▁bass ▁and ▁keys ; ▁Will son ▁playing ▁alto ▁sa x oph one ▁and ▁guitar ; ▁and ▁Cost ello ▁altern ating ▁between ▁ac oust ic ▁and ▁electric ▁gu it ars ▁as ▁well ▁as ▁lead ▁and ▁harm ony ▁vocals . ▁ ▁Crit ical ▁acc laim ▁Response ▁to ▁The ▁O aks ▁has ▁been ▁over wh el ming ly ▁positive . ▁ ▁In ▁their ▁short ▁life - span ▁The ▁O aks ▁have ▁established ▁themselves ▁not ▁only ▁in ▁the ▁central ▁Florida ▁scene , ▁but ▁nation ally ▁and ▁intern ation ally ▁as ▁well . ▁ ▁Some ▁notable ▁performances / app ear ances : ▁ ▁Show c asing ▁artist , ▁ 2