MSG = monosodium glutamate
The tinnitus you’re experiencing sounds like musical tinnitus aka musical hallucination.
I experience the same. Repeating tones usually in a loop of 10 seconds or so. It appears to be mostly music from my childhood for whatever reason (Happy Birthday, children’s nursery rhymes, Christmas songs, U.S. national anthem, etc.)
I have the Jeopardy final answer soundtrack playing at the moment even though I barely ever watch the show and certainly haven’t watched it recently…
It’s not always noticeable or on all the time. I have low-level steady-state tinnitus as well.
I’m 43 years old and started experiencing hearing loss and regular tinnitus at 24. The musical tinnitus kicked in around age 33.