To this end we have implemented a chord edits feature which would allow you to change any odd chord to one that is more appropriate - very often, there are just one or two chords in a song which are wrong but which would be easy to correct when you have the whole song in context. There are two points to the edits feature - firstly so that people can have a correct version of the song they are trying to play. Secondly, the software is actually receiving the edits and analysing the data which will make it produce more accurate transcriptions in the long term. So this is an ever-improving process towards becoming more precise.
You can now also rate the quality of the chords, which allows you to give your feedback on individual songs more easily and in a structured way that will enable us to make the improvements that you want to see - or rather, hear!
As it is free to chordify any song, do continue using the service as other songs will chordify better than the one that you have tried but if you do have any more questions or require further assistance, please don't hesitate to get in touch.