Raga Marwa was one of Harrison's favourite ragas, having become familiar to him through interpretations by Ravi Shankar and Ali Akbar Khan.[6] In the Indian tradition, the piece is renowned for its ability to invoke a melancholic mood at sunset.[2][7] Harrison recorded "Marwa Blues" as a tribute to the raga and in acknowledgement of the importance of Indian music in his life.[8]
The track includes Harrison's slide guitar parts and keyboard accompaniment. As described by Peter Lavezzoli in his book The Dawn of Indian Music in the West: "Along with its Hawaiian flavor, the melody sounds as if it could have been played by a sarod or vina, and is yet another demonstration of Harrison's unique slide approach ..."[2] Author Simon Leng calls it "the most personal and emotionally resonant guitar performance of his career" and identifies the track as the culmination of the musical and spiritual journey Harrison had begun in 1966 as a sitar student under Shankar.[9] Leng also writes: "His playing is at once almost unbearably touching and spiritually enraptured, offering a multidimensional emotional experience."[10]