I'm crazy when it comes to tuning, I admit it. My bandmates throughout the years have had to endure with my obsession with being in tune. Other than messing up a part in a song, which by the way most audience members don't usually catch on to, there is no better way to ruin a number than a bandmate being out of tune. If you're on stage you need a tuner under your feet or in your rack. If you're practicing at home, one of the tuners in the article below should do the trick. I have had pretty good success with Guitar Toolkit so I have no reservation in recommending that product. Happy playing and don't forget to tune.