Em7/5+ I know Em7 is a minor 7th chord, but what does the /5+ mean? I thought that the slash would be followed by a root note other than the E, but I do not know what the 5+ indicates following the slash. Thanks.
This isn't standard notation. But we can try to work out what someone might have meant by it. Maybe the slash is an error, they just mean Em7+5. That's Em7 with a raised 5th. E, G, B# (Ok, call it C) D. Maybe they want the raised 5th to be the bass note, though it's hard to see why this wouldn't be written as C(add9). What comes before and after it? Are we doing the James Bond riff: Em, Em+, Em6, Em+ ? (Sounds a bit odd with the 7th in there though.) The lesson here is that someone has either tried to be clever, or has been sloppy, and no-one knows what he means. So don't do that!