Find a font that includes the circled P sound recording copyright symbol (usually a special symbol font) such as MS Reference 1. MS Reference 1 is installed by several Microsoft products including Windows 95 and Windows 98. In that font, the symbol is mapped to the same position as the registered trademark or circled r character of typical fonts. To access the symbol type Alt+0174 (on a PC) then highlight the character and change the font to MS Reference 1. Or, use Windows Character Map.
You could also purchase Jon Cotton's circled P sound recording copyright symbol fonts from The Fantasic (P) Font Page. Available for Mac System 7.x and higher and Windows, it comes in multiple font styles. Like it? It's 'buy-Jon-a-drink'-ware. Use PayPal to send Jon $5 or so and he'll email the circled P files to you.
Can't find a font with the symbol? Create a circled P symbol in a graphics program and insert the graphic in your document. Or, create the circled P symbol in a graphics program and insert it in a never used position within an existing font (requires font editing software to do this or there may be companies that will personalize a font in this way).
On the Web, creating a graphic of the circled P is the only way to put the sound recording copyright symbol on a Web page. There is no current HTML code for that symbol except with some Unicode fonts. Some of these Unicode fonts may include the Sound Recording Copyright Symbol.

