What does something like that cost?For the last 10+ years I have been using the Westone Custom Made ES49's plugs with the easy to pop in and out (but not fall out accidentally) Etymotic ER-15 Filter. The ER-15 provides a uniform flat 15 dB of sound reduction from 125 Hz through 8 kHz.
There are other filters available that block more or less sound. The 15's are the most appropriate for musicians.
Mine are clear in color and it's hard for anyone to see they are even in.