The PBET is a test of playing by ear ability which can be launched in R/Shiny via the psychTestR package.

Seb Silas, sebsilas@gmail.com

Short PBET with feedback: https://musicassessr.com/PBET-demo

1. Install nodeJS: https://nodejs.org/en/download/

2. Install R: https://cloud.r-project.org/

3. Install RStudio: https://posit.co/downloads/

4. Launch RStudio

5. Install the devtools R package by pasting the following command into the RStudio terminal:

install.packages('devtools')

6. Install the PBET package:

devtools::install_github('sebsilas/PBET')

Once you have completed the above steps, you can run the PBET test by doing the following:

1. Create a folder which will contain your app. The name of this folder will become the app_name argument when you run the PBET or PBET_standalone functions later.

2. In the folder, create an R file called app.R. In this file, paste your code to run the PBET there, like below:

# Load the PBET package

library(PBET)

# Run a short test with feedback:

PBET_standalone(app_name = 'my_PBET_app',
               skip_setup = TRUE,
               absolute_url = "https://adaptiveeartraining.com",
               num_items = list("interval_perception" = 0L,
                                 "find_this_note" = 0L,
                                 "arrhythmic" = list("key_easy" = 1L,
                                                     "key_hard" = 1L),
                                 "rhythmic" = list("key_easy" = 1L,
                                                   "key_hard" = 1L),
                                 "wjd_audio" = list("key_easy" = 0L,
                                                    "key_hard" = 0L)),
               examples = list(
                 "find_this_note" = 0L,
                 "interval_perception" = 0L,
                 "arrhythmic" = list("easy" = 0L, "hard" = 0L),
                 "rhythmic" = list("easy" = 0L, "hard" = 0L), # because it's effectively the same task as arrhythmic
                 "wjd_audio" = list("easy" = 0L, "hard" = 0L)
               ),
               feedback = TRUE)

Remember that the app_name argument should match the name of your folder.

3. Make sure that your current directory is the app folder you created. You can check the current directory by using getwd(). You may need to set the app directory by placing setwd('/Users/musicassessr/my_project/my_PBET_app') at the beginning of your app file.

4. Run the app. To do this in RStudio, use the shortcut Command + Shift + Enter on Mac (Ctrl + Shift + Enter on Windows).

5. If the above steps were successful, the PBET test should load in your web browser, and as you progress through the test, you should receive feedback after each trial. Recorded audio should appear in the /app_name/www/audio/ directory.

If not, go to our Troubleshooting page or raise an issue on Github.

• This has not yet been tested on Windows. We will be doing this very soon.

• The test requires internet connectivity.

• The PBET runs in your web browser. It is only recommended to run the test in Google Chrome or Opera. You will need to set one of these to be your default browser for RStudio to launch the test there (restart RStudio after doing this).

We advise mentioning the software versions you used, in particular the versions of the PBET, musicassessr, psychTestR, and psychTestRCAT packages. You can find these version numbers from R by running the following commands:

library(PBET)
library(psychTestR)
library(psychTestRCAT)
if (!require(devtools)) install.packages("devtools")
x <- devtools::session_info()
x$packages[x$packages$package %in% c("PBET", "psychTestR", "psychTestRCAT"), ]

Silas, S., Müllensiefen, D., & Kopiez, R. (2023). Play By Ear Test: Development and validation of an open-source playing by ear test. In prep.