The Three Musketeers was an 1844 novel by Alexandre Dumas.
There are more famous threes I don't have pictures for:
Other music groups that opted for less....
In classical mythology, 3 was considered to be sacred number. Everything was a multiple of 3. For instance, the 3 Fates, the 9 Muses, and the 12 Labors of Hercules.
