Diction classes and singing lessons
"For the sheer sensual joy of singing, no language gives me more pleasure than French." (Renée Fleming)
There is a clear link between teaching, singing and accent correction. That's why as a linguist, but also a musician, I warmly suggest singing for some students, so that their ear can better distinguish the sounds of the language.
I also like to define myself as a voice developer, encouraging my students to sing, when I feel that their voice is ready for that. Improving one's diction or being able to sing simply requires the person to work on their breathing (abdominal in particular), on the pitch and range of the sounds, as well as on the rhythm. Singing is a wonderful form of expression and is very enjoyable, but it also enables you to enhance your singing and spoken voice.
Here is an example of a student whom I taught: