We are always on the lookout for new tracks to add to our workout playlist, so when something fresh drops, we are the first to share it with you guys. After months of speculation over when we'd be hearing new music from Rihanna that we could add to our workout music playlist, the day has finally arrived. This past Saturday night, RiRi surprise-dropped "FourFiveSeconds," a brand new song featuring guest vocals from Kanye West, and Paul McCartney on the guitar. The three-minute-long track is sweet, upbeat, and stripped down; a pop music ode to repenting in the morning for the foolish mistakes you made the night before. "Pour It Up," this is not. But it's a totally fresh sound for Rihanna—and we're 100 percent feeling it. (I've already listened to it three times since I started writing this post. SO. GOOD.) I think this would be an amazing cool-down track after killing your workout. Maybe it's just me, but when I listen to this track I can start to get the sense of the summer that is still months away - I love the summer, and this gives me hope after such a brutal winter. You can download "FourFiveSeconds" for yourself on iTunes right now, or stream it here. Still no word on her next album's Ri-lease date, but if this song is any indication, it'll be well worth the wait. If you guys have come across any other good workout tunes let us know in the comments below!