Cool, but it's an odd graph. It's mixing up physical formats with purchasing methods. TV, Internet and Mobile are all purchasing methods; they belong on a graph with Record stores, yard sales, etc.
CD, 8-track, Cassete and Vinyl are formats or mediums, and belong on another graph with other formats like reel-to-reel tapes, digital music files, etc.
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CD, 8-track, Cassete and Vinyl are formats or mediums, and belong on another graph with other formats like reel-to-reel tapes, digital music files, etc.