The sneaky-fun app Fusic lets music fans from all over the world become a part of their favorite videos. With the Fusic desktop or iOS/Android app and a webcam, users can create their own video mashups by singing (or lip-synching) along with dozens of major acts and having their homemade footage spliced into the professional clips. Originally founded as Audish.com in 2011, the site allows fans to browse thousands of other user-submitted videos--some of which have view counts in the tens of thousands.

From Justin Bieber to Kelly Clarkson to Evanescence, Fusic offers a wide range of music videos within the top 40 sphere of influence. Yet the app allows any music fan to participate: Facebook authorization makes signing up simple, and choosing between lip-synching and actually singing begins the mashup process. The app itself handles the editing, transitioning seamlessly between the music video footage and what users capture on their webcam, and sharing across social networks takes a few clicks.

Acts like One Direction and Austin Mahone have actively promoted their Fusic pages on their respective Twitter and Facebook profiles. The site easily facilitates the type of audience participation that has become an integral part of pop music consumption during the past year: fan remixing. Such Billboard Hot 100 hits as Gotye's "Somebody That I Used to Know," Carly Rae Jepsen's "Call Me Maybe" and PSY's "Gangnam Style" are all examples of songs whose success was driven by thousands of online fans remixing and uploading their own versions. Recognizing a cultural shift, Fusic has become the go-to platform for the no-hassle fan remix.