WASHINGTON — Today, music lovers have more ways than ever before to access their favorite songs and discover artists they’ve never heard of. Can’t live another minute without “Call Me Maybe”? Download it on iTunes for just $1.29, or stream it over your smartphone with Spotify. Want to hear something different? Let Pandora Internet radio pick something for you, or turn to Grooveshark, a sonic Facebook, to see what other music nerds are listening to.