Nothing in music is ever certain, and there is no way to guarantee that a song will become a hit,
However, according to The Washington Post, there are some similarities that many smashes have with one another that you can consider when writing a tune that may help it reach the ears of millions. Most successful singles share these traits:
Stay in one key and are in 4/4 time
They last between three and five minutes
They’re organized into chunks of four or eight bars
They have a repeating chorus played two to four times
They include the title sung at least three times
They feature short melodic fragments that repeat a lot to help everyone to remember them