the solresol effect is when you look at how bad solresol was and think "i could write a better language" and then do
I won't. But I could.
The idea of a "musical language" that you could play on an instrument is appealing. It's extreme conlangerbait in the best possible way, something a lot of people independently converge on. The thing that makes it especially conlangerbait is that the original musical language solresol is not great.