Martin directed Epstein to find a good publisher, as Ardmore & Beechwood had done nothing to promote "Love Me Do", informing Epstein of three publishers who, in Martin's opinion, would be fair and honest, which led them to Dick James. Martin's formal musical expertise helped fill the gaps between the Beatles' unrefined talent and the sound which distinguished them from other groups, which eventually made them successful. Most of the Beatles' orchestral arrangements and instrumentation were written or performed by Martin, as well as frequent keyboard parts on the early records, in collaboration with the less musically experienced band. It was Martin's idea to score a string quartet accompaniment for "Yesterday" against McCartney's initial reluctance. Martin played the song in the style of Bach to show McCartney the voicings that were available. Another example is the song "Penny Lane", which featured a piccolo trumpet solo that was requested by McCartney after hearing the instrument on a BBC broadcast. McCartney hummed the melody that he wanted, and Martin notated it for David Mason, the classically trained trumpeter. Martin's work as an arranger was used for many Beatles recordings. For "Eleanor Rigby," he scored and conducted a strings-only accompaniment inspired by Bernard Herrmann. On a Canadian speaking tour in 2007, Martin said that his "Eleanor Rigby" score was influenced by Herrmann's score for the Alfred Hitchcock thriller "Psycho". For "Strawberry Fields Forever", he and recording engineer Geoff Emerick turned two very different takes into a single master through careful use of vari-speed and editing. For "I Am the Walrus", he provided a quirky and original arrangement for brass, violins, cellos, and the Mike Sammes Singers vocal ensemble. On "In My Life", he played a speeded-up baroque piano solo. He worked with McCartney to implement the orchestral climax in "A Day in the Life", and he and McCartney shared conducting duties the day that it was recorded. Martin contributed integral parts to other songs, including the piano in "Lovely Rita", the harpsichord in songs such as "Because" and "Fixing a Hole"; the old steam organ and tape loop arrangement that created the Pablo Fanque circus atmosphere that Lennon requested on "Being for the Benefit of Mr. Kite!" (both Martin and Lennon played steam organ parts for this song), and the orchestration in "Good Night". The first song that Martin did not arrange was "She's Leaving Home", as he had a prior engagement to produce a Cilla Black session, so McCartney contacted arranger Mike Leander to do it.