Read the error messages carefully, they tell you what’s wrong.
Within #drum-machine I can see 9 clickable “drum pad” elements, each with a class name of “drum-pad”, a unique id that describes the audio clip the drum pad will be set up to trigger, and an inner text that corresponds to one of the following keys on the keyboard: Q, W, E, A, S, D, Z, X, C. The drum pads MUST be in this order.
your .drum-pad elements have no id
Within each .drum-pad, there should be an HTML5 < audio > element which has a src attribute pointing to an audio clip, a class name of “clip”, and an id corresponding to the inner text of its parent .drum-pad (e.g. id=“Q”, id=“W”, id=“E” etc.).
each <audio> should be a child of a .drum-pad element, not a sibling
The rest of the tests fail because they can’t find your audio elements, as they’re not where they’re supposed to be.