Free Online Business Plan Software

Do I really need a license to write songs and sell music?
Some people paid me to write songs for them and is something very easy. I get about $ 20 per piece. One problem is that I was using a "free" version of a music sequencer called the firm, but my plans are actually buying the software once I have enough money to afford it. Besides this issue, but I wonder if it's ok to write, record and sell songs to people without any form of permit or license. I live in California and I do all this online business. I do not want trouble, I will also purchase recording programs as soon as possible haha.
While claiming your profit on your taxes will go well. When the government does not get their cut, you'll be trouble.
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