"Dear Mr. President" by P!nk

One of the biggest pop stars of the modern era, P!nk (aka Alecia Moore) puts plenty of her Philly soul into her gritty and boisterous pop. Her chart successes have included four #1 hits so far, and plenty more top 10 hits.

But there is much more to P!nk than partying and scorning ex-lovers. Whether she is empowering others with terrific songs like "F**kin' Perfect", which went to #2 in 2011, or stripping things down to duet with the Indigo Girls to question the President, P!nk is always smart and emotive. The song is from 2006, so the President she was putting on the spot was George W. Bush.

"Least Complicated" by Indigo Girls

Who doesn't love the angelic harmonies of Amy Ray and Emily Sailers, aka the Indigo Girls. Everyone knows the sound of this Grammy-winning folk rock duo, yet they've never had a top 40 hit. Their debut single on the charts was 1989's brilliant "Closer To Fine," which stalled at #52. "Galileo" only reached #89 in 1992. The Indigo Girls had their best charting single in 1997 with "Shame On You," which got to #42. Shame on all of us for not giving these two many well-deserved top 10 hits, which could have included "Land of Canaan," "Love's Recovery," and "Power of Two."

"Least Complicated" comes from their 1994 album, "Swamp Ophelia." I always thought of it as a sequel to "Closer To Fine."