## 3 Materials and Methods
### Experimental Study
#### 3.4.2 Tasks  
During training sessions involving AR-assisted tasks, participants need to wear color-coded markers on the fingers of their left hand that corresponded to the color-coded instructions provided by the ad-hoc app created for this study: Blue: index finger, yellow: middle finger, green: ring finger, violet: little finger (see Figure 1). The app displayed the chord that needed to be played by the user at the top of the screen. It recognized the fret board of the guitar and then displayed the necessary finger placements onscreen (mirror view). Using AR, color-coded instructions were superimposed on the neck of the guitar on the correct string and fret (see Figure 2). The assistant asked the participant to place his or her fingers on the strings as indicated by the app, ensuring the color of the markers on their fingers matched the AR color-coded instruction onscreen. If fingers were not placed correctly, a red error marker appeared onscreen. When fingers were placedcorrectly, the participant could then play the chord by strumming the strings of the guitar over the sound hole of the guitar with the thumb of their right hand. Using the computer's in-built microphone, the ad-hoc application evaluated the sound frequencies emitted as the participant attempted to play the chord. If the chord was played correctly, the app allowed the user to advance to the next chord. In the case of the traditional teacher-led methodology, participants received feedback from the teacher as they played the chord (Figure 3). The teacher showed the participants how to perform chords using guitar chord charts (Figure 4). Participants read these chord charts to understand finger placement and then played the chord. The teacher provided assistance as necessary. For both tests, a time limit of 2 min was set for each task. Tasks were logged either as \"successful\" or \"unsuccessful\". The 2 min time limit was established based on it being 4 times the average time taken by the guitar teacher to correctly perform the chord in the AR app. Figure 1: Color-coded markers used on fingers. Figure 3: Evaluation in the traditional methodology. Figure 2: Example superimposed image of Augmented Reality (AR) color-coded instructions. * Task 1: Play C major chord Participants were asked to position their fingers as instructed and press firmly: finger 1 on fret one of the second string; finger 2 on fret two of the fourth string; finger 3 on fret three of the fifth string. They were also told not to return the sixth string to ensure the chord was played correctly. * Task 2: Play D major chord Participants were asked to position their fingers as instructed and press firmly: finger 1 on fret two of the third string; finger 2 on fret two of the first string; finger 3 on fret three of the second string. They were also told not to return the fifth or sixth strings to ensure the chord was played correctly. * Task 3: Play E major chord Participants were asked to position their fingers as instructed and press firmly: finger 1 on fret one of the third string; finger 2 on fret two of the fifth string; finger 3 on fret two of the fourth string. They were also told to return the sixth string to ensure the chord was played correctly. * Task 4: Play F major chord Participants were asked to position their fingers as instructed and press firmly: finger 1 on fret one of the first and second strings; finger 2 on fret two of the third string; finger 3 on fret three of the fourth string. They were also told not to return the sixth string to ensure the chord was played correctly. * Task 5: Play G major chord Participants were asked to position their fingers as instructed and press firmly: finger 1 on fret two of the fifth string; finger 2 on fret three of the first string; finger 3 on fret three of the sixth string. They were also told to return the sixth string to ensure the chord was played correctly.