Favorite? That's too hard.  I like too many!  Here are the first few that came to mind...
If you can't tell by my selection.  I love love good vocalists.  I'm not a huge fan of all the synthesized stuff these days.
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| Billy Boy (Billy Joel). Of course.  He will always be up there on my list.  I'm a sucker for good vocals and good piano | 
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| Celine. Good for belting along too. if only I could sound remotely close to her... | 
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| Josh Grob-the-man | 
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| Jupiter One.  Thank you to flotrack for introducing me to these cuties.  Some good running stuff right here.  Go listen to "Count Down". |