It is real important to have a guitar that is in tune and stays in tune. Part of singing is matching pitch. You cannot match pitch to an instrument that is not tuned correctly.
The first and best advice I can give is, If you are singing along to your own guitar playing, is get yourself a Guitar tuner. Also learn how to tune your guitar without a tuner. This will help you understand what matching pitch is.
Once you learn how to tell when your guitar is out of tune you will also be able to tell when you are singing out of tune.
Me and Bobby McGee Cover
in REVIEW YOUR SINGING - SHARE YOUR SINGING
Posted
You right i hadn't tune the guitar for days.