Incantation

Sounds effect humans and the world in a lot of ways. Humans use sounds in a sequence to form words or sentences. Some can create music with sounds and music can effect the human mind in a lot of ways. Even make a person suicidal. Recently, a shinobi researcher discovered that certain sounds can effect their chakra in certain ways. Using these sounds in a sequence is called an "incantation." Shinobi who use incantations are called spell casters or wizards. Wizards use these sounds to mould chakra in the same way a regular shinobi would use hands signs to preform ninjutsu or genjutsu. Wizards are able to preform ninjutsu and genjutsu by saying these special sounds. The ninjutsu created by this is a bit weaker then using the common way, however it does give the shinobi a huge upper hand in battle because it's a lot faster and the shinobi doesn't have to worry about chakra control.