Jon Burlingame editorThe number and range of superstars vying for Emmys this year – everyone from Kanye West and 50 Cent to Mick Jagger and Imagine Dragons – is staggering.More than 600 entries in the seven Emmy music categories were unveiled today as voting began for the nominations round. Nominations will be announced by the Television Academy on July 12.The most star-studded category is that of best song (technically, “original music and lyrics”).