Here are a few MP3s that features Siwon singing and playing drums.
I separated the mp3s in 3 categories: Siwon singing alone (unfortunelly there aren't many performances of him singing alone), him singing with others (I only added miscellany songs because the songs of him and Suju together is easy to find) and last but not least Siwon playing drums on some live performances.
Siwon might not be skilled in singing as much as other members of Super Junior like Kyuhyun, Ryeowook and Yesung, for example (Siwon even said he don't consider him much of a singer but he enjoys singing), but I love his voice, It's really sweet. And I love to see him playing drums too!
I like all the mp3s posted here but I marked with '*' my personal favs of each category. ^^
Credits:
All MP3s were uploaded by Rasckita and all were ripped by me (except the 2 songs he performed with SJ- KRY). If you want to share these MP3s please give credits to:
http://rasckita.blogspot.com/
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Siwon Singing Alone:
Siwon - Chwejoongjindam (Cover of Junlamhwe's Song)*
Live @ 1000 Song Challenge
The download link is: http://sharebee.com/5a707a3e
Size: 2.06 MB / Length: 2:15 min
Siwon - Can You Feel The Love Tonight (Cover of Elton John's Song)
Live @ Loveletter)
The download link is: http://sharebee.com/cea98ca6
Size: 608.62 KB / Length: 38 sec
Siwon - Do You Love Me (Ni Ai Wo Ma)(Cover of Fan Yi Chen's Song)
Live @ Hunan Happy WeiShi Camp
The download link is: http://sharebee.com/2324b20e
Size: 521.68 KB / Length: 33 sec
Siwon - Sea Of Love (Cover of Fly To The Sky's Song)
Live @ ????
The download link is: http://sharebee.com/73a47d67
Size: 688.62 KB / Length: 43 sec
Siwon - ????
Live @ Loveletter
The download link is: http://sharebee.com/1818a5a4
Size: 297.19 KB / Length: 18 sec
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Siwon Singing With Others:
Hankyung & Siwon - Like Rain, Like Music (Cover of Kim Hyeon-Sik's Song)
Live @ Hunan Happy WeiShi Camp
The download link is: http://sharebee.com/d146e0a3
Size: 620.7 KB / Length: 39 sec
Super Junior K.R.Y. (feat. Siwon & Eunhyuk) - Once Again, Even If You Hate Me (Cover of VIBE's Song)*
Live @ Music Wave (08.18.06)
The download link is: http://sharebee.com/7967d382
Size: 3.88 MB / Length: 4:14 min
Super Junior K.R.Y. (feat. Siwon & Kangin) - Sea Of Love (Cover of Fly To The Sky's Song)
Live @ Music Core - Power Recital (060722)
The download link is: http://sharebee.com/11e6bc19
Size: 1.57 MB / Length: 1:42 min
Siwon, Hankyung & Kyuhyun - The Moon Represents My Heart (Cover of Teresa Teng's Song)
@ Yue Ce Yue Kai Xin
The download link is: http://sharebee.com/534da3d7
Size: 1.08 MB / Length: 1:11 min
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Siwon Playing Drums:
The TRAX - First Rain (Feat. Choi Siwon on Drums)*
Live @ 060903 SBS Inkigayao
The download link is: http://sharebee.com/577c5f9a
Size: 2.55 MB / Length: 2:47 min
Henry (Vocals & Violin) & Siwon (Drums) - Julia (Cover of LeeHom's Song)
Live @ SJ-M's 100th Day Celebration
Download link: http://sharebee.com/c69d0359
Size: 1.78 MB / Length: 1:56 min
Super Junior - Luxemburg (Siwon on Drums)
@ Super Junior's Live Concert (Super Show CD)
The download link is: http://sharebee.com/a749c348
Size: 3.33 MB / Length: 2:24 min
Dream Band - In You & Let's Go On A Trip
Live @ Dream Concert (2008-06-07)
The download link is: http://sharebee.com/f3c29af4
Size: 3.39 MB / Length: 3:41 min
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Labels: Audio, Siwon, Super Junior, Super Junior M