A.D. Amorosi Beyond the misdeeds and greed of the beloved televangelist family featured on HBO’s “The Righteous Gemstones,” one of the most marked elements of its co-creators’ rude, enlightened and hilarious series is its music.As with every other series creator-writer-actor Danny McBride has co-concocted — including 2009’s “Eastbound & Down” and 2016’s “Vice Principals” — the unique musical tone of “The Righteous Gemstones” comes down to the longtime friendship of college buddies McBride, composer Joseph Stephens and music supervisor Devoe Yates.Where the musical mix of “Gemstones” is concerned, theirs is a genuinely fresh blend of new or rare sacred songs intimately tied to an equally bracing, secular Southern-fried brand of rock, blues, country and soul, to say nothing of its hot and holy original music and nuanced arrangements.