Nashville first fell in love with Turk McNamara as he filled the room, night after night, performing traditional Irish music. Soon, Nashville songwriters came to recognize the talent and truth in Turk’s own lyrics and performances. Now, he hosts Nashville’s best as he brings together talents of all stripes to share their songs, along with  his own, in ”Turk’s Lounge,” which he defines as “Nashville — How It Used to Be.”