A friend of mine stumbled on some homemade Bemani megamixes done a few years back, and they were really fantastic. I've done the legwork of extracting the full-length audio, the video is nice, but with very few exceptions it only showed what the current song was. Admittedly, merely "displaying the current song" is done in a very attractive manner.

All of these mixes are done to a theme which you can view via the YouTube links. They're done by a Japanese individual, so the titles are a bit... different.

DDR Non-stop Mix For Weekend Dancers
YouTube Part 1: http://www.youtube.com/watch?v=K4ZlLclX_R8
YouTube Part 2: http://www.youtube.com/watch?v=tPE6BZQqguk
YouTube Part 3: http://www.youtube.com/watch?v=9CHBoaNHrpk
YouTube Part 4: http://www.youtube.com/watch?v=cPARNwk-tXk
Audio Only: 週末のDDRメドレーを　あの頃のようには踊れない.mp3

beatmania IIDX オサレメドレー(Non-stop "SMART" medley)
YouTube Part 1: http://www.youtube.com/watch?v=myILay4Lrm4
YouTube Part 2: http://www.youtube.com/watch?v=_Hqri67xBbY
YouTube Part 3: http://www.youtube.com/watch?v=VFf1orZEVhQ
YouTube Part 4: http://www.youtube.com/watch?v=lL6oHti2dts
Audio Only: オサレ メドレー.mp3

beatmania IIDX Non-stop PANGRAM Medley the YATSUGIBAYA（矢継早）
YouTube Part 1: http://www.youtube.com/watch?v=lhIZkvN-u1M
YouTube Part 2: http://www.youtube.com/watch?v=ZrnZeSqHMHo
YouTube Part 3: http://www.youtube.com/watch?v=O5lu6ygoYmo
YouTube Part 4: http://www.youtube.com/watch?v=SyoFiHAVjvg
Audio Only: IIDX XXXXXX medley the 矢継早.mp3

beatmania + IIDX Non-stop Pangram Medley the SIIZAKANA (強肴)
YouTube Part 1: http://www.youtube.com/watch?v=aEbUK2tSMoc
YouTube Part 2: http://www.youtube.com/watch?v=X6wJ35I67rg
YouTube Part 3: http://www.youtube.com/watch?v=aaBsFnwXLN4
YouTube Part 4: http://www.youtube.com/watch?v=0G0Cz7_Qex4
Audio Only: 強肴 (A).mp3

It'd be really nice if these were uploaded as a single video to YouTube now that you can. However, the video descriptions have links that take you to the full-length Nico Nico Douga version of the video. IIRC those require a login, which I suspect most people don't have and why I'm not linking to that instead.

vandalous likes this.

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It's not a Bemani mix, but related in that it's from ITG, but I wish LOKI would upload his mix of "Zodiac" and "Don't Play Nice".

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Who likes mashups?

I do!

RandomBemani's YouTube Channel has got a ton.

I'm currently listening to [beatmania Mashup] Nonstop Mash-up Megamix type Trance

Good stuff.

I think Konami's DDR facebook page posted about the DDR nonstop mix, seemed pretty cool from what I've heard.

which reminded me of this one:
beatmania IIDX music select mix (long) (basically every main 'song select' theme from 3rd up through DJ TROOPERS)
https://www.youtube.com/watch?v=U_sYXYvnMGo

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OLRmy since 6/23/2002!
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If it wasn't already obvious, the source of most of these mixes is katsuode. I'm listening to Pop'n music Nonstop Mix the "Thermidor" (selection 04) right now and it's freaking amazing. Definitely an account worth poking through at some point.