Tefillah
Vidui With a Nigun:
It is related (Ohr Yesharim, page 181) that the Baal Shem Tov Hakadosh zy"a once came to a certain village before Rosh Hashanah and asked the residents who would serve as baal tefillah for the Yomim Noraim. He was told that the Rov of the city would be the chazan. He asked them how he led the tefillos, and they said that he recited Vidui with a joyful tune.
The Besht went to meet the Rov, and he asked him to explain his custom. The Rov replied, "Imagine a servant of a king who has the lowly job of washing the floors in the courtyard. If he loves his king, while he is mopping and cleaning up the garbage, he is very happy because he is making the king's castle clean. Therefore, he will sing a happy song while he is doing his job. So too, while we recite Vidui, we are cleaning our souls and removing all the garbage that has accumulated over the year. That's why we should be happy at that time."
When the Besht heard this, he said, "I want to daven here on Yom Kippur.”