For him, the songs were truly not only audio but audio-visual. He saw music as it were; and only when he could how the song could be filmed, did he okay it's recording. His use of elaborate sets, of light and shade to convey sombreness and technicolor to project joy, were all part of his visual perception.
He was very fond of composing tunes, he composed tunes with Ram Ganguli with whom Shankar, Jailishan used to play Harmonium and Tabla. It was there the birth of the Team of Shankar Jaikishan and Raj Kapoor took place, that entertained the music lovers. He had a sharp music sense. Raj Saab was a complete musician. He played the tabla, the harmonium, and the piano. He composed songs and sang them in his own voice before handing them over to professional playback singers.
His music journey started with Papaji (Prithviraj Kapoor) in theatre in Calcutta. When he came to Bombay he learned classical music playing Harmonium, Tabla, and Sitar at Narayan Rao Vijay Academy. He was also with Anil Biswas for some time.
Raj Kapoor's song sittings were very famous, all the stakeholders of the song used to be invited on the sittings, time was no limit, everyone present cold give his suggestion. He loved to listen to tunes, to prune and trim the compositions, to correct the singers. He also sits with the Lyricist to change a particular line or word which is not matching the tune, he perfected the compositions to suit his taste.
Songs in RK films were never just 'there'; they were seamlessly woven into the fabric of the film, used intelligently and sensibly to complement the narrative.
