Amazon is debuting an HD version of its music service, which means its digital sound quality will henceforth be on a par with that found on CDs. Music executives, some who have pushed for different tiers of subscription beyond Apple Music and Spotify’s typical $9.99-per-month, said Amazon’s move is “a sign of the music-streaming market’s maturation.” Although Tidal offers an HD sound service, Amazon Music, at the No. 3 spot by subscription numbers, will be the first major service to offer comparable quality audio. Continue reading Amazon Music to Introduce HD Service for CD-Quality Sound