What makes Heart Full of Soul by The Yardbirds notable?

'Heart Full of Soul' reached number 2 on the UK Singles Chart and number 9 in the US, highlighting its commercial impact. Its innovative use of fuzz guitar greatly influenced later rock music and showcased The Yardbirds' pioneering role in the development of psychedelic rock. Released on June 4, 1965, 'Heart Full of Soul' marked The Yardbirds' third single and solidified their sound during a transformative period. This era followed their initial success with 'For Your Love,' showcasing their shift toward a more experimental, psychedelic style with Eric Clapton's departure and Jeff Beck's arrival in the lineup.