Amazon Prime now includes 100 million songs and ad-free podcasts. The e-retailer membership scheme – which gives account holders access to quicker delivery and other perks such as Amazon Prime video – has increased the amount of audio-based content available from 2 million songs to 100 million and a number of podcasts “at no additional costs”. Steve Boom, the vice president of Amazon Music: “When Amazon Music first launched for Prime members, we offered an ad-free catalog of 2 million songs, which was completely unique for music streaming at the time. We continue to innovate on behalf of our c…