u/Proof-Bet8356

This is for research purposes, i have never cut deep enough that i did need it but it is a worry of mine and would like to be knowledgeable in what it would look like. How could i tell if its so deep that i would need stitches? Does it constantly bleed or would it stop?

Planning on making a birthday edit for my best friend with a song by any of these artists. If you listen to one or all of them which song would be the best to use?