To rehearse for singing, you might want to warm up and do some vocal exercises and then work on some repertoire of your choice or whatever your voice teacher has assigned you.
When you sing from your stomach or rather your diaphragm, the sound is usually stronger and your chest doesn't hurt as much. Usually you do that when singing a long phrase or loudly so you don't run...
Singing 20 minutes a day can bring down snoring. Also, if your good enough, you could star a band. Some people like Britney Spears or Micheal Jackson, are so good you can become famous which can earn...