YouTube used to be a very good company, all songs are available here but because there is no Competitor in the market, they are doing things in their manner & not in the Favour of their Users. Because of thier Greed of Money, they play ad after every single Song/video. Until & unless you do not go to Premium, they'll keep showing the useless Ads after every song & this really frustrate the Mood but they don't care. They care more of Money & less of Customer satisfaction.