If you search DecodeUnicode for "note", you'll see several different types of notes, with their unicode number. I'll show you the quarter note. The unicode number of a quarter note is U+2669. Remove the U+ and add a &#x to the front and a ; to the back. ♩ will turn into a ♩ on many pages.
All unicode characters can be expressed with numbers, but only a few are named like ♥. Notes are not included in the named entities. Here is a full list: [Link](Mouse over link to see full location)
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