Spotify is very good streaming app for discovering new music. You should also register at last.fm. You can discover what are the popular songs, most listened artists by a lot of people.
I guess that applies to majority of smartphones nowadays. Smartphone manufacturers don't pay much attention to the quality of their hardware as they know people would normally change phones every 1.5 years or so.
AMOLEDs have better colors, contrast and all but the whites are putting me off. It's either they're inaccurate (bluish, pinkish) or just plain dirty (yellowish, brownish). So I prefer IPS LCD.