In 1970 Linda Ronstadt's career hadn't quite been rolling along until her second solo album, Silk Purse was released and Long, Long Time hit the airwaves. The song was penned by Gary White and Linda picked it as exactly what she had been looking for. Although a few other artists have covered it, it will always be one of her signature songs.
The guitar accompaniment is easily done with arpeggio patterns and a few passing bass notes. The lesson is presented in the key of G, but Linda's recording was in A, by using a capo at the second fret. It goes over the progression, the arrangement, and really pushes modifying and varying the patterns every time you run through it.