[quote name='GarethFlatlands' timestamp='1331941510' post='1581387']
Our singer started as he wanted more control over vocals and was pretty bad to begin with. He ploughed regardless on and is now a very good vocalist so[b] I think with practice most people can be good[/b], and a good teacher is always a good start as with most things. So yeah, go for it and put the effort in and you'll see results.
[/quote]
That's what I think too (but I am generally a stupidly optimistic b***ger).
Genuine tone deafness is very rare and (I think) a clinical condition.
My belief and observation is that most people can 'sing' a tune properly in their heads but can't always sing it out 'for real' properly. This is because they lack the skill to use the tools they have (the vocal chords, the links between brain and voice, breathing etc). properly. These skills can be taught, learned and practised.
Whether anyone becomes a singer of character that others want to listen to, and are engaged by, is a different matter!