iTunes Turns 20 This Year. Here Are 5 Lessons All Entrepreneurs Can Take Away From Its 2 Decades of Disruption Posted byJohn Boitnott December 1, 2021 Leave a comment on iTunes Turns 20 This Year. Here Are 5 Lessons All Entrepreneurs Can Take Away From Its 2 Decades of Disruption Reflecting on this milestone, there’s a lot we can learn from the service’s hugely successful campaign to disrupt the music industry.