<![CDATA[In music, there are many various problems. One of them in the guitar instrument. If the sound quality of the strings in the guitar instrument is not calibrated properly, then the sound produced will not sound beautiful. There are 423 chords in the music. There is no practical way to understand a chord other than reading a chord book. When writing a song, naming a chord is necessary, so that when the song will be played by others musician, the musician can understand the existing chord. From these needs arise problems such as how to design a system that can calibrate the tone and detection a chord on a musical instrument. In this study, the system of calibrating the tone and detection a chord was made for the guitar instrument. System design process and user interface is done by using Labview programming. Because inputs are received in the form of acoustic signal, it is necessary to apply fast fourier transform algorithms in signal acoustic filtering. System testing is performed to determine the system's functionality in detecting tones, the time required to acquire data until the tone appears, the accuracy of the tone calibration and the chord detector. Performance generated by the system in the detection tone detection test, tone calibration test, chord detection test, the percentage of success is 100%. In the data acquisition process until the average tone appears the time required is 0.622933 seconds.]]>
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