Joseph
The issur of listening to music is not as clear cut as you seem to think. The Mechaber/Rema only mention avoiding Chasunahs and haircuts. The M”B says regarding dancing for reshus “yesh lizaher”
I do agree with the OP as I remeber a time when no Ashkenazim made chasunahs during sefira at all in accordance with the Taz. I am not sure why it changed, maybe due to population growth?