Bug with the website

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Uncaught ReferenceError: song is not defined
noteFromPoint https://onlinesequencer.net/resources/c/...145.js:183
onmousemove https://onlinesequencer.net/resources/c/...145.js:204
jQuery 7
dispatch
handle
trigger
trigger
each
each
trigger
P https://onlinesequencer.net/resources/c/...d145.js:34
H https://onlinesequencer.net/resources/c/...d145.js:34
jQuery 2
dispatch
handle
55e814fbaeba730a0cb1f1102908d145.js:183:236
noteFromPoint https://onlinesequencer.net/resources/c/...145.js:183
onmousemove https://onlinesequencer.net/resources/c/...145.js:204
jQuery 7
dispatch
handle
trigger
trigger
each
each
trigger
P https://onlinesequencer.net/resources/c/...d145.js:34
H https://onlinesequencer.net/resources/c/...d145.js:34
jQuery 2
dispatch
handle








it says this in the place where to change grid and it is spamming it really fast