Musician for many years, due to Covid no income from music last year, can I still take deductions?

My husband has been a professional musician for many years. Due to Covid in 2020 he did not make any income from music. He has painted houses as his main business for a few years now and has only done music part time. We normally claim his painting business as his primary business and income and then an additional business as a musician with that part time income. This past year he did not take in any money for music; however, he still had expenses. For example, an amp needed repair, he bought some recording software in an attempt to do work remotely (which didn't work out). Should I list the "musician" as a business with no income and just list the expenses - as a loss? Will that trigger anything or be a red flag?