Bluegrass mandolin player Ronnie McCoury became the albumâ s official â bluegrass guruâ to make sure that there was â someone who could make sure we didnâ t do anything clichÃ or triteâ . The album has a bluegrass or progressive bluegrass core ; bluegrass mandolinist Ronnie McCoury became the albumâ s official â bluegrass guruâ to ensure that there was â someone who could make sure we didnâ t do anything clichÃ d or triteâ .