I know what you mean about diction. I don't know if some people just don't realise that the words aren't coming across clearly, or they think the words arent as important as the tune. For me they are equally important, and I always try to work hard on my diction.

I think I can sing as well with a guitar as without one, but only if I have practised the guitar part until my fingers are sore!!! There are some songs I sing that really need accompaniment, and others that i do much better unaccompanied.

Another thing I have noticed is that people will tolerate a bad singer who can play the accompanying instrument well, much more than people tolerate a good singer who isn't so hot on the other instrument. Am I imagining this?

Bagpuss