Most people tend to have different interests, but very few people can put into them practice because of the fear of pressure. The author of the article recommends that people should pursue at least 2 type of jobs in their career. The author himself has multiple jobs because they can make him happier and perform better.
The author uses three reasons to illustrate his points. First of all, having multiple jobs can enhance your skill development. For example, the experience of record producing makes him have the experience beforehand and makes the working more interesting.
Secondly, having different jobs can ensure you have different types of friends so that you can learn new perspectives from them.
Finally, working in different jobs can help to cultivate new ideas. For example, people working in a bank may need to find a band performance and the band may need a donation. Therefore, people who have those contacts can create the need for both of them and solve their problem.