Nobody sets out to hit #2, much less set a record for the most weeks at #2, but that's what Adele's 21 does this week. The album logs its 24th week at #2 on The Billboard 200 album chart. This enables it to tie Bruce Springsteen's 1984 album Born In The U.S.A. for the most weeks at #2 since 1963, when Billboard combined its separate mono and stereo charts into one comprehensive chart.

Both albums, of course, also hit #1. Born logged seven weeks at #1. 21 has spent 23 weeks on top.  Adele's still active album will doubtless add to its tallies of weeks at #1 and #2. (In fact, it's expected to return to #1 next week.) But for now at least, it has spent more time at #2 than it has at #1. For an album that has had been so charmed in every way, that's a surprise.

Justin Bieber's "Boyfriend" tops the 2 million mark in digital sales in just its ninth week. It's by far Bieber's fastest-selling hit. "Baby" (featuring Ludacris) took 20 weeks to top the 2 million mark in June 2010. "One Time" took more than 13 months to top the 2 million mark in August 2010.

"Boyfriend" has appeared in the top 10 on the Hot 100 for all nine of its weeks. It regains its bullet this week for the first time in four weeks.

Even more impressive than the sales has been the well-executed stylistic shift from the bouncy bubblegum of "Baby" to the slinky and sexy "Boyfriend." Female singers can get away with sounding younger than their years (it's hard to believe that Carly Rae Jepsen is 26, given the giddy, breathless nature of "Call Me Maybe"), but guys in pop need to act their age.

If music is the soundtrack of our lives, that's especially true in the summer. The radio is a constant companion at backyard barbeques, pool parties and road trips. You'll probably always associate "Umbrella" by Rihanna featuring Jay-Z with the summer of 2007, just as, if you're old enough, you'll link the Emotions' "Best Of My Love" with the summer of 1977.

Now that summer is upon us, it's a good time to scroll back through the biggest songs of summers past. These are the songs that logged the most weeks at #1 on Billboard's Hot 100 during the summer months of every year since 1955. These are the songs that you heard over and over at the beach or on vacation or on that endless ride to Grandma's house.

This isn't what Jennifer Lopez wants to hear as she comes down from the high of the two-hour season finale of American Idol (and as she weighs the decision of whether to re-sign for a third season with the hit show), but her current single seems to be running out of gas on the Hot 100. "Dance Again," featuring Pitbull, drops from #17 to #19 in its seventh week. Singles often move up and down, but since J.Lo's twice-weekly Idol visibility is coming to an end, at least for this season, it's starting to look like #17 will be this record's peak.

By contrast, "On The Floor," J.Lo's 2011 collaboration with Pitbull, logged 15 weeks in the top 10, peaking at #3. I don't think "Dance Again" is as striking as "On The Floor." As Randy Jackson might say, "This one was just OK for me."