I am totally new to LaTeX (using overleaf), but I have a handle on the form of the document I want to create--just missing a couple pieces, which include the special characters I need to replicate from a music theory textbook.
Specifically, I am trying to use these special characters
I consulted this article, but it is 348 pages long, and I figured I would ask the community before scanning the whole document. Moreover, I will need a pointer as to which packages to load so that I can use the special characters I am looking for.
Thank you in advance for the help!

\includegraphics. // For creating the image, if you use something like IPE then you can export into EPS format. – Willie Wong Apr 15 '21 at 17:22