In 1971 Alfred considered Lee's "Ronny Lee Guitar Method" so salable that it bought the back cover of a Musical Merchandise Review issue to advertise it. By 1979 he had increased this to more than 80 guitar instruction books. Alfred Music is still selling Lee's "Christmas Guitar Book" and "Beginners's Chord Book". However his "Twist Music for Guitar" and "Rhythm and Blues for Guitar", books of "original compositions" written for Sam Fox Publishing Co., are among those no longer in print. One of Lee's most-enduring books is his "Jazz Guitar Method", which he wrote for Mel Bay Publications as two volumes in 1962. Mel Bay is still selling "this highly acclaimed study of jazz rhythm chords and their application [that] contains extensive instruction on jazz chord accompaniment and chord substitution" as a single volume in paper and as an eBook as of 2015. By 1974 Lee had written two new series of thoroughly graded, easy to follow guitar instruction books: "The Ronny Lee Step by Step Guitar Method" in 6 volumes, and "The Ronny Lee Step by Step Chord Method for Guitar" in 4 volumes. He retained or re-acquired the copyrights to these series and they are still being sold at his own website, together with "Advanced Chord Playing for Guitar by Ronny Lee" in 2 volumes that he published in 1979-80. The two principles that Lee followed in these series are that (1) note playing and chord playing should be taught separately—even if simultaneously, and that (2) step-by-step means that the student should never be obliged to make any mental leaps—as competing method books often do. He expanded the step-by-step principle with "Learn to Sing Step by Step", which he published with two cassette tapes (now reissued as CDs) in 1984. Because Lee became fully occupied with writing by 1964, he had to discontinue his studio. He chose not to sell it because he did not wish to sell the right to use his name. By 1971 he was teaching guitar and bass guitar students at his Midtown Manhattan home. For some time after 1984, Lee visited Veterans Administration hospitals with Bedside Network Hospital Show Tours #9 "Sophisticated Misbehavin'", a five-person group of show business artists sponsored by ASCAP who interpreted the music of "Fats" Waller and "Duke" Ellington. He published the guitar method "Learn How to Play Any Song by Ear" in 2011—writing the text on his computer despite having developed macular degeneration.