Beck's contribution was described in a June 1965 single pre-release review in "Beat Instrumental" as providing an "oriental touch" and it was seen as helping to introduce "the psychedelic subgenre known as 'raga rock'", according to di Perna. William Echard adds "'Heart Full of Soul,' released in June 1965, is often said to have marked the arrival of raga rock be pivotal in shaping the look and sound of 1960s psychedelia." Music writers also identify Beck's use of a fuzz box as a milestone: according to French, "'Heart Full of Soul' was one of the first significant uses of fuzz guitar on record—taped a month before the Stones recorded '(I Can't Get No) Satisfaction'", while Lavezzoli claims that the song is "the first time such a tone had been used, soon to be employed by Keith Richards".