NEW YORK (AP) – Do you remember when the “M” in “MTV” stood for “music”? MTV is going back to that for one day. MTV, along with VH1 and CMT, will focus solely on music for Independence Day. MTV will devote certain hours to different music genres and highlight musicians like Justin Timberlake, Bruno Mars and Macklemore and Ryan Lewis. VH1 will show videos and concerts by Alicia Keys, Pink and Maroon 5. VH1 will also do a live broadcast of the Philadelphia Independence Day concert with John Mayer, Jill Scott, Demi Lovato and The Roots. CMT will focus on artists like Carrie Underwood, Luke Bryan and The Avett Brothers.