Your MP3s: Remember when Apple’s ads made a computer choice feel like an artistic statement? The “Think Different” days seem long gone as the company enters the streaming music field with Apple Music, a service mostly distinctive for its impending unavoidability if you use iTunes. For years Apple sold digital music, but you have to wonder howmuch longer it will care about your purchases nowthat it courts truckloads of cash in monthly rental fees. Stock up on CDs now. “Gameof Thrones” going off-book: Given the realities of TV, HBO’s series had to race ahead of George R.R. Martin’s gestating fantasy saga and into new directions. Still, as an uneven fifth season closes thisweek there are red flags, including rushed character shifts, a tiresome repetition of cruelty to women and, lastweek, a dragon-assisted action sequence that came together with the CGI subtlety of “Clash of the Titans.” Hopefully the game can change.