Recorded Music Media Evolution

There was a time, a few decades ago, we were packing up our LP's and trading them in for cassettes, an invention of Phillips of Holland. I bought my first cassette player in 1969 in Geneva,  Switzerland.
At the same time, I bought Led Zepp's first album, and being a bit or an adolescent rebel, I played it in public loud enough to piss off people in the vicinity. Time moves on, and now my tunes are on my iphone, and yes, there still are some Zeppling tunes in the playlist.
This Graph shows how we have migrated to the latest, newest thing.
I wonder what's next . . .

click the graph