I just the saw the film "Love Masao Kimi ga Iku!" with SMAP's Shingo Katori.....the film closed with Aachan's solo 君は僕だ (Kimi wa Bokuda)....so I remembered this clip where Shingo and the SMAP bros joined Aachan (and no problem with Masahiro Nakai being out of tune, Aachan's sweet voice still comes out great):