This practice continued from the time part-singing begins in the music course, compels the boys to use the thick register.
Even up to the change of voice, boys can often force the thick register several notes higher than women sopranos.
They can only do so by using the thick register, which it is so desirable to utterly avoid.
The tone used in ascending the scale of C, singing loudly, will be reedy, thick and harsh—the thick register.
I have seen a singer pull himself together, and with a tremendous effort shout a high A in the thick register.
Flattening while intoning is almost entirely due to boys using the thick register.