Balls by Egantx7

Question 12

When Italy was united in the 1860s, this procedure, for musical purposes, was outlawed, and the Vatican began phasing out people subject to this procedure for musical purposes in 1878. John Henry and Funny Cide both were subject to this procedure, and Thomas Corbett, the man credited with killing John Wilkes Booth, notably did this to himself. Identify this procedure.