Deploying a contract simply means uploading your song to the blockchain & to the Sound.xyz site. Deploying requires signing a transaction in your wallet to pay for the fees that the Ethereum network charges to upload & store your music.
Since the blockchain is immutable, there is no way to be able to edit any parts of your release once it has been deployed (except for price). Therefore, please make sure to review your song release & make any final changes before you hit the ‘Deploy’ button.