Here's a video lead by Kazuhiko Inoue.
A group of seiyuus who sang for the benefit of those who are afflicted
by the TSUNAMI and EARTHQUAKE.
Some of 'em are OKIAYU RYOUTARO, ITOU KENTAROU,
MIYUKI SAWASHIROI, HOSHI SOUICHIROU, KONISHI KATSUYUKI,
SEKI TOMOKAZU, TAKAHASHI NAOZUMI, etc..
Here's the link: