How big was the audience for President Barack Obama's inauguration? Big -- 2 million-people-on-the-National-Mall kind of big.

About 37.8 million U.S. TV viewers watched Obama take the oath of office Jan. 20, making it the second-most-watched presidential inauguration after Ronald Reagan's, which attracted 41.8 million viewers, according to Nielsen Media Research.

Thanks to strong ratings for the main event and related programming, the unprecedented level of musical star power that provided the soundtrack to the Obama inauguration is paying off in increased sales for participating acts.

The pre-inaugural festivities got under way Jan. 18 with HBO's telecast of the We Are One concert at the Lincoln Memorial, which featured U2, Bruce Springsteen, Sheryl Crow, Stevie Wonder and will.i.am. According to Nielsen SoundScan, all of the songs performed during the concert that are available as digital tracks made an immediate jump in sales.

Click here to read the full story, including specific song sales increases, television viewership numbers of inauguration festivities and the concert promoters who helped make the live music events possible.

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