Great topic. Right now I’m using the Etymolic Standard Fit blue High Fidelity earplugs.
https://www.etymotic.com/consumer/hearing-protection/er20.html
What I like about these is that they have a cord. Last year, I used something else. I can’t find the order, but they did not attach to a cord, and I found that I had inserted one rather deeply and it was not easy to get out. The Etys pull out with the attached neck cord.
If you go to live music, it’s imperative to have something. Years ago I used a “sonic valve” that was for industrial use. I think that company started to make protection for shooters and changed their name.
Ordinary foam earplugs protect, but they will not let you hear the music well. A good hi-fi protector does. These Etymolics do tend to cut highs slightly more than lows, but you won’t find perfect. I’ve been told that the blue tip standards are softer than the clear large tips. I find the blue tip standard fit well.
Etymolic’s general hearing protection page is here:
https://www.etymotic.com/consumer/hearing-protection.html