Check 'Character Palette' and 'Show input menu in menu bar'. To make it available in any program, go to System Preferences -> International -> Input Menu.In programs like Safari and TextEdit, choose Edit -> Special Characters.If you want to insert the few most-common musical symbols into text, such as putting a flat sign ♭ in the middle of a sentence, you can use the Mac OS X Character Palette, a window that lets you select symbols and special characters visually.
