The music industry has gone through many changes in distribution formats over the years from vinyl records to CDs to digital downloads and streaming. The introduction of new technologies like the cassette tape, CD, Internet and iTunes disrupted the industry and changed how consumers obtained and listened to music. While digital formats and streaming have made music more accessible, it has also impacted sales revenue for record labels and artists. The music video also played a key role in music marketing from its beginnings in the 1960s to becoming a major promotional tool with the launch of MTV in 1981.