Musical interlude: Jimmy Fallon, Robert Plant, Apple iPad by Philip Elmer-DeWitt @FortuneMagazine October 1, 2014, 10:13 AM EDT E-mail Tweet Facebook Google Plus Linkedin Share icons . A priceless bit of free advertising that illustrates nicely Apple’s advantage — as long as it lasts — in being first to market with profitable mobile app ecosystem. Thanks to The Loop’s Dave Mark for the link. Follow Philip Elmer-DeWitt on Twitter at @philiped. Read his Apple AAPL coverage at fortune.com/ped or subscribe via his RSS feed.