Improve your pronunciation (and grammar) with singing!
If you search YouTube for a song title or musician/band and add "lyrics," often you will find the audio track with the words included as a slide presentation. Sing along to improve your pronunciation. Your grammar will also improve, because you will remember certain phrases together (ex. take someone down somewhere in "Strawberry fields Forever").
Not sure which song to look for?
Pandora is FREE when you sign up, and you can see the full lyrics under the album by clicking "Show More."
Here is Billboard's Hot 100 Songs listing. Here are some traditional American songs. Here are some typical American children's songs.