The thing is, I wasn't actively trying to figure out Little Mascara, but I came up with something that sounds almost identical to Paul's guitar. Did Paul use a capo on this one? It sounds just like it, but it was a sheer coincidence that I came up with this; so I'm a bit skeptical still.
yeah, i play it in standard tuning sans capo too and it sounds good and is easy to play. i never mess around with the open tuning, maybe i should give it a try?
Open tunings are how Paul flavors all of his stuff. It started all the way back with Let It Be and "Answering Machine" being in Open A. Since then he's never stopped. It's the way a lot of signature sound of songs like "Left of the Dial," "Can't Hardly Wait," and "Alex Chilton."
They're all playable in standard, but to get all the right over-tones and vibe open tunings are the way to go.