In a PEOPLE exclusive, singer Georgette Jones Lennon writes an emotional letter to her late parents George Jones and Tammy Wynette for what would have been her dad's 91st birthday on Sept.

Jones was indeed on a downward spiral, a descent that would pick up speed some 14 years later, when he took up with Tammy ...

After creating nine studio albums together and delivering countless glimmering singles to country music's 70s and 80s golden era, Tammy Wynette and George Jones have long been regarded as one of ...