If your machine sounds like it is playing Jingle Bells for you, you should really oil your hook. Oil it at least every other bobbin. Once oiled, run your machine with thread for 6-10 inches of stitching on a scrap of fabric or batting. You will notice that your thread picks up the excess oil, and you do not want that on your quilt. If you do get oil on a quilt, pat a bit of cornstarch on the stain along the stitch line. Leave it for at least an hour (overnight is fine, too) and then brush it away. You will be quite relieved to find the oil spot has disappeared….
Add a drop of oil right here:

Oh, and uh, my apologies to Shakespeare…