1. Achtung Baby (1991) - U2 didn't just "chop down the Joshua tree" (as they've said), they sent it through a wood chipper with songs like "Zoo Station," "The Fly" and "Acrobat." Achtung Baby was a much darker album than people were used to from them. They embraced alternative rock, as well as dance and electronic music. It's so hard to pick a top song, because each one can probably lay claim to it. Anyone who hasn't heard this album must do it now. The accompanying Zoo TV Tour is possibly the most original & creative concert tour of all time, so the "Zoo TV Live from Sydney" DVD is also worth picking up.
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2. The Joshua Tree (1987) - The Grammy-winning album that sent them into the stratosphere. It's their best-selling album, with classics such as "With or Without You," "Where the Streets Have No Name" and "I Still Haven't Found What I'm Looking For." This was a more mainstream sound than their early-80s post-punk albums, also showing their versatility in songwriting. The most underrated song on the album is "Exit" which starts with a slow build then explodes into a loud rocker. I'm a sucker for that. From top to bottom it feels like the album is full of radio friendly hits.
3. All That You Can't Leave Behind (2000) - It's not their most creative album, but the songs very simply kick ass and never seem to get old as the years go by. Another big Grammy winner, it features the amazing "Beautiful Day" as well as other hits like "Elevation" and "Walk On." One of their best tracks, "Kite", was never released as a single and shows that even the deeper tracks on this album have as much, and maybe more, strength than the singles. Often called U2's third masterpiece after Achtung Baby & The Joshua Tree. It took U2 into the 21st Century in the most perfect way, and they haven't looked back.
4. War (1983) - My favorite of their pre-Joshua Tree albums, this has a lot of energy for a politically charged album, their first album that deals with politics and war. "Sunday Bloody Sunday" and "New Year's Day" are the well-known tracks, but most of the album has songs that are equally as good. War is one of their hardest rockers taking what they did on the first two albums to the next level. "Two Hearts Beat as One" is a rocker that makes you want to get up and move, U2 is always good at that. This is the album that proved they were more than a one hit wonder.
5. No Line On The Horizon (2009) - This one isn’t very mainstream, but it all flows together nicely, definitely an underrated album. It's a bit more experimental than the other U2 albums from the 2000s. "Breathe," "Magnificent," "Unknown Caller" and "Moment of Surrender" all stand out. It's their most visual album along with The Unforgettable Fire. "Get on Your Boots" is a good song, but is much better the way they perform it live with a different intro. Bono said the album would be more experimental that the previous two, but they probably could have taken that further.