One popular example is Danger Mouse's 2004 The Grey Album. (Mashup of The Beatle's White Album and Jay-Z's Black Album) posted by czytm at 12:09 PM on October 15, 2012 [3 favorites]
Four comments in and nobody's mentioned Girl Talk? posted by box at 12:10 PM on October 15, 2012 [2 favorites]
For some history, here's a good article that ran in the NYT in 2002.
One of my favorites that has been around for about about a decade is this mashup of Fugazi and Destiny's Child
And there's the album Dean Gray American Edit, which is basically a mashup of Green Day's American Idiot album with all the songs Green Day ripped off (and is a much better album than the Green Day album). posted by The World Famous at 12:15 PM on October 15, 2012 [2 favorites]
DJ Earworm makes some pretty awesome mashups. "Stairway to Bootleg Heaven" is one of my favorites. posted by rhiannonstone at 12:16 PM on October 15, 2012
I love listening to the Best of (year) and Holiday mashups (get Halloween now) over at Bootie. posted by THAT William Mize at 12:18 PM on October 15, 2012 [3 favorites]
DJ Z-Trip is off-and-on in terms of whether or not I can stand him, but Uneasy Listening Vol. 1 (direct link to .zip file) is solid, and one of the awesomest earlier examples of the genre. posted by carsonb at 12:23 PM on October 15, 2012
Bootie is always fun, nthing Girl Talk and Kleptones.
One that hasn't been mentioned yet is Norwegian Recycling, who have some great albums that differ from the "mainstream" mashups (hello, Eminem vs Final Fantasy VII fight theme) posted by Lemurrhea at 12:24 PM on October 15, 2012 [3 favorites]
One big early Mash-up album was the Grey Album - a mix of the Beatles White Album with JayZ's Black Album. It is good stuff. posted by Flood at 12:26 PM on October 15, 2012 [1 favorite]
Yes, definitely Girl Talk, The Grey Album, & Bootie compilations. Some resources not linked to yet: Lenlow Kleptones (particularly Yoshimi Battles The Hip-Hop Robots and A Night At The Hip-Hopera, even if you don't really think yourself a hip-hop fan) Jay-Zeezer - The Black And Blue Album
Wu-Tang Vs. The Beatles - Enter The Magical Mystery Chambers is another genre-mashing one that I rather enjoy. It's no longer on its original site.
I love mashups - mostly pop mashups. Some of the great DJs are:
#DJ Earworm, mentioned in a previous comment.
#Mashup Germany
#Robin Skouteris
There's a great line of dance parties in London and Tel Aviv called "A.D.D." or, "Music for the A.D.D. Generation", you can look for them on facebook for new hits.
Sorry for not linking; internet problems. posted by alona at 12:37 PM on October 15, 2012
The first one that I remember actually being kind of a crossover hit was Sugababes' 2001 single "Freak Like Me" which was a re-recording of an Adina Howard/Gary Numan mashup mixed by Girls on Top/Richard X.
My favorite (and this is riiiiight on the edge of totally embarassing) is still Freelance Hellraiser's A Stroke of Genie-us (Strokes/Christina Aguilera), which I think also came out in 2001 or thereabouts. posted by bcwinters at 12:40 PM on October 15, 2012 [2 favorites]
Self-ish link: Codpaste is a podcast series by sound artists Vicki Bennett and Ergo Phizmiz about the history and practice of mashups and sound collage. posted by moonmilk at 12:49 PM on October 15, 2012
Let's go back to a time when mashups were called bootlegs (or booties) and were primarily a UK phenomenon: the seminal two-hour 2 Many DJs/Soulwax "Hang the DJ" mix that aired on BBC Radio 1 on Christmas Day 2001 is available on archive.org and the first ten minutes on YouTube. Nirvana vs. Destiny's Child "Smells Like Booty" is my favourite off that mix.
Also, a quick shout-out to my newest obsession: R. Kelly vs. Carly Rae Jepsen. If you don't like this, you don't want good things in your life. Just kidding. But not really. posted by mhum at 12:50 PM on October 15, 2012 [1 favorite]
For history's sake, do look into the work of John Oswald, who coined the term "plunderphonics". posted by knile at 12:56 PM on October 15, 2012 [3 favorites]
Also, I recall Kid606's mashup album being pretty glitchy and fun when it came out a decade ago, but I haven't actually listened to it in a long time and don't know quite how well it holds up. posted by a box and a stick and a string and a bear at 1:14 PM on October 15, 2012
Maybe I need to put more time in, but I came into this world via DJ Earworm and I have yet to hear anything as good. These were the first ones I heard, and almost everything I've heard since has paled by comparison.
All fan-made videos, which should probably just be sent to a background tab while you listen. posted by chazlarson at 1:20 PM on October 15, 2012 [1 favorite]
Gotye/The Police: "Losing Somebody I Used To Know" posted by emelenjr at 1:21 PM on October 15, 2012
The absolutely essential Go Home Productions 'This was Pop 2002 to 2007' is available in a 108 Mb zip file here. Tracklist & many, many other lovely things here. Honestly, this bloke really knows his booties. posted by punilux at 1:28 PM on October 15, 2012
Nthing Bootie and the Kleptones. The Bootie compilations will give you an idea of whose style you like so you can investigate them further. posted by immlass at 1:28 PM on October 15, 2012
I don't like many mashups, but these two are brilliant:
Mashup.fm is a streaming site, with an IOS app, that let's people play mash-ups. You'll hear a bunch of new, old and classic stuff there. posted by haqspan at 6:44 AM on October 16, 2012
If bands who play live mashups of other artists' songs or styles count, there's Beatallica, who play Beatles songs in the style of and mashed up with the lyrics and riffs of Metallica songs. Here's Everybody's Got A Ticket To Ride Except For Me And My Lightning
And, of course, Dread Zeppelin, who play mashups of reggae/metal/Elvis/Led Zeppelin. It's both better and worse than you imagine. posted by The World Famous at 9:50 AM on October 16, 2012
posted by MuffinMan at 12:03 PM on October 15, 2012 [2 favorites]