How do you find the number of the songs played on your iPhone?

To find the number of songs stored in iTunes click on the Music library (usually at the top of the left hand pane) and details will be given along the bottom of the iTunes window - How many songs, how long to listen to them all, and the amount of space used to store them. If you click on the text it will give you the exact time needed to listen to them all in Days, Hours, Minutes, and Seconds.