"Help!" was written by John Lennon, who considered it one of his favorites. In several interviews before his death he called it "personal" and one of his best songs (along with "Strawberry Fields Forever"). It went to Number One the week of September 4, 1965 and stayed there for three weeks, through the week of September 18.
Here's a fantastic LIVE version of the song from a TV broadcast in the UK from 50 years ago. Amazing how well the Beatles sound when you can actually hear them!