There simply isn’t enough information in your post to even hazard a guess.
What Sonos speakers do you have?
How are they connected?
What device is your controller running on?
What music source are you trying to play?
Have you tried playing any other sources?
Are there any errors that show up at any point, beyond just ‘the music doesn’t play’?
What specific guidance did you follow?
If you run the ‘check for updates’ process, what response do you get?
If you’re looking for help from Sonos reps, I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it, or post the diagnostic number here for a Community Moderator to pick up.
There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.
When you speak directly to the phone folks, there are more options available beyond just the diagnostic analysis.