The Amazon Echo can’t control a FireTV. I guess they’re different groups at Amazon. And not all the music you want is available on Amazon Prime. Royalties, contracts, etc being what they are, sometimes Amazon can’t find something you want. But, even if an artist or song isn’t available, you can often hook into a channel that fills the void on iHeartRadio. So, let’s connect the two. To get started, you’ll want to log into http://alexa.amazon.com. Then, click on Music & Books and then scroll down to the listing for iHeartRadio and click on the logo. If you haven’t linked an account, you’ll only have the option to “Link your account now”…