Ko" to the National Recording Registry. Recording session "Ko Ko" was recorded on November 26, 1945, at WOR studios in New York City. In the booklet accompanying Charlie Parker: The Complete Savoy Studio Sessions author James Patrick gives a full account of the session, informed by "[d]ocuments from the Savoy files and the recollections of Teddy Reig, who produced the session ..." Other recordings at this session were "Billie's Bounce", "Warming Up a Riff", "Now's the Time", "Thriving on a Riff", and "Meandering". The album The Charlie Parker Story fully documents this session, as does the aforementioned Complete Savoy Studio Sessions box set. Duke Ellington also wrote and recorded an unrelated song entitled "Ko-Ko" in 1940 at Victor's studios in Chicago. Ellington's version of the song was inducted into the Grammy Hall of Fame in 2011. Structure There were two takes: In both takes the piece starts with a 32-bar introduction that was written by Charlie Parker: Bars 1–8 – Alto saxophone and trumpet in unison octaves Bars 9–16 – Brief trumpet solo Bars 17–24 – Brief saxophone solo Bars 25–32 – Alto saxophone and trumpet in thirds/fourths, then briefly in octaves Following the intro in the first take, sax and trumpet begin the melody of "Cherokee". They are interrupted by someone clapping and whistling and shouting "You can't play that". After the introduction in the second take are two 64-bar solo choruses from Parker on the saxophone; each chorus follows the Thirty-two-bar form (AABA), except that the number of bars is doubled to 64, partly due to the extensive importance of solos in bebop music, and partly due to the extremely fast 300bpm tempo. The absence of any composed material on this recording, besides the introduction and coda, is a telling example of the bebop musicians' strong emphasis on improvisation first. It is an extremely virtuosic solo, incorporating fast eighth note playing and energetic improvisation. Parker's use of accents keep his phrasing from sounding rhythmically monotonous. This phrasing style gives his bebop soloing a vocal and melodic quality even as his tactfully executed lines fly by at nearly imperceptible speed. The second chorus of Parker's solo opens with a two-bar quote from the notably difficult clarinet piece "High Society", made famous by clarinetist Alphonse Picou. Charlie Parker was known to quote melodies from a variety of musical traditions in his improvised solos, and this particular solo is no exception.