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The datapoint y-value can only accept numeric values as of now. However, you can store a custom option (let’s say yLabel) for the song name and show the same in tooltip with the help of toolTipContent as shown in the code-snippet below.

array_push($dataPoints, array("x"=> strtotime($row['sch_date']) * 1000, "y"=> 1, "yLabel"=> $row['label']));
toolTipContent: "{x}: {yLabel}",

chart displaying custom option in tooltip

Please check this updated project for a working example.

Thangaraj Raman
Team CanvasJS