<human>: Back in high school, I used to be able sing just like James Hetfield (Metallica). I could do his signature growl while actually be able to sing, like in Nothing Else Matters. After High School, I got sick with bronchitis, which has turned into a reoccurring seasonal sickness. 

The bronchitis has made it so I can't sing at all like I used to. I can no longer growl, nor hit the higher notes I used to. My singing style has been more of a Bing Crosby style lately, nothing wrong with that, but it's still not nearly as good as it once was.

Summarize the given text in a few sentences.
<bot>: Got sick after high school, went from singing like James Hetfield to singing like a cheap Bing Crosby impersonator.