Handwriting and other details have been reported based on the notes of David Berger, Andrew Homzy, Dr. Theodore Hudson, Walter van de Leur, and Dr. Mark Tucker.
There appear to be numbers from the Duke Ellington Band Book: 8, 13.
23 parts and an indefinite number of scores
Hold on is contained in one folder consisting of 1 four-page piano vocal score, 1 four-page short score, 1 two-page short score, 1 one-page piano conductor score, 1 two-page conductor score, and 17 parts in d minor concert, and 1 one page piano conductor score and 6 parts in C Major concert -- in ink and pencil -- in unidentified hands (Parker, other?).
Piano vocal score lyrics begin "Noah, Noah, let me come in ...". Four page short score indicates parts for flute, clarinet, bass clarinet, trumpet, violins, viola, cello, piano. Two page short score indicates parts for bass clarinet, trumpet, violins, viola, cello. One page piano conductor score in d minor indicates parts for flute, bass clarinet, trumpet, violins. Two page conductor score indicates parts for voice, 3 trumpets, bass clarinet, violins, viola, cello, bass, piano. Parts in d minor for 4 reeds - oboe, clarinet 1, clarinet 2, bass clarinet; horn; 3 trumpets - A, B, C; drums; 3 violins - A, B, C; viola; cello; bass; banjo; guitar. Parts in C Major for 1 reed - bass clarinet; 1 trumpet - 1; 2 violins - 1, 3; viola; bass. One page piano conductor score in C Major does not indicate instrumentation. -- from the Duke Ellington Library.