"Zenbu Ore" is a series of videos that the sound (including songs and voice percussion) is created by a single person.
"Zenbu" means everything, "Ore" means me or myself, so it means everything is done by me. "Ore" is basically used by men only. All of the sound that you hear from those videos are performed by one person's voice.
This video "Orerhythm" is a parody of Polyrhythm, uploaded by a creator called PUPI, most of the lyric is changed to fit the word "Ore" everywhere...
This one is an awesome voice percussion performance - song from Final Fantasy 7 "Sarani Tatakau Monotachi" by PUPI
Xenogears "Hishou" by PUPI
Final Fantasy 8 "The Man With The Machine Gun" PUPI
"Uninstall" by Re
Someone created this video (within around 1 hour...) which has the original music on the left speaker and Re version on right speaker. AMAAAZING. Please make sure you use headphones/earphones when you listen to this clip!
I love this one too...
"Makkura Morino Uta" (Hiroko Taniyama) by Konori
This is not really "Ore" as the main vocal is a different person, but an excellent voice percussion (zenbu ore except the main vocal)
"Sousei no Aquarion" vocal by Halyosy, voice percussion by MosaMosa
Chronotrigger "Tokino Kairou" by SunaP
Rosen Maiden "Seishoujo Ryouiki" (ALI PROJECT) by SunaP
"Bad Apple!" by Ken
One person doing a 16 people chorus
"Daichi Sansho" by fr33dam