There was “a tear in every word,” is how longtime producer Billy Sherrill once described Tammy Wynette’s singing voice. It was the first lady of country music’s signature: a trembling, anguished voice that seemed to hold a teardrop in each note. Wynette had the ability to sell songs like “D-I-V-O-R-C-E” or “I Don’t Wanna Play House,” ’60s suburban melodramas as …