It's interesting but the conversation about SC really sums up what I feel about CW's books.
With due respect to the Rosh Yeshiva, it's a cute story, but just plain false, and actually quite insulting. If you don't want to walk out when carlebach sings, that's a legitimate position, but to mock those who had a different position says more about how comfortable you are with your position than them.
You don't have to take my word for it, others here can vouch for my grandfather’s musical knowledge and ability. But more, he knew carlebach, was friends with him. It was extremely painful for him to watch him use his talents in the ways he did.
People didn't walk out because of Carlebach's sexual abuse, that wasn't known or discussed in those days. They protested his flagrant disregard for halacha in the name of bringing people closer to yiddishkeit.
If someone sang a Carlebach song in front of my grandfather, they got a stare down for the ages. Not because he was "tone deaf" - he gave you a similar look if you got a note wrong in Der Pastach - but because of the painful memories it elicited.
Having said that, I don't know that he would have walked out of a wedding, he probably would have stayed and danced with his old friend, even as it pained him to overhear Esa Einai the next day.
That's more connected to what's at play here. When you see, or when your kid sees a Chaim Walder book, what is going to come to mind? I'll never be able to read kids speak without wondering if he based this story on a child he abused emotionally or physically. An abuse survivor who sees people's speak on your shelf will immidiately be triggered and retraumatized.
Does that happen when carlebach music plays? For some, yes, for 99.9% of people no.