I always try to post chords for old standards when they are requested--the published chords are often wrong, at least for guitar(even when they work for piano),and you often have to clean up a lot of the stuff that is posted at Olga before you can use it--so even when it seems like stuff is readily available, it often isn't very useful--

Often people put the chords over or in the lyrics with no indication of the time value--it is much better to have the chords written out measure for measure, so you can simply count off and play--it allows to play an accompaniment even if you don't know the melody, and it makes it very easy to play when someone is improvising--

My chords are either arrangements that I have played before, or new things that I have worked up for the request , so I am always sure that they really work--I don't just cut and paste something--