It's hard to explain but there is a rare tranquility one can get from chanting, or singing spiritually. For me it serves as both a mood tamer and healing. Also, I feel that when I do sing in ethereal manner, I achieve this sense of my spirit is speaking. Most of the singing I do is when I shut off all thoughts and focused on sound or a few words rather then full lyric stanza of a song. I often find myself singing to foreign language songs such as Urdu, Farsi, or Latin.
Of course I do this when nobody is around. I do have an awful singing voice, however, tranquil enough to do the job.
One of these days I going to a quiet woods and chant away.