I love it when YUI does her occasional cover, because she usually picks interesting songs. This song is called Tsubasa wo kudasai (翼をください) and was originally performed by the folk song group Akai Tori back in 1971.
YUI ~ Tsubasa wo kudasai Live@Music Lovers 20111113
20MB 3:44 H.264/AVC 480×272 PSP Ready
You can really hear the 70’s carry through. It has a nice feeling to it.