Here's the speech. The act is a bit tough for me because I don't know what they're referencing.

We met Matsuzaki Shigeru-san on April 21, 2012 at our concert in Yokohama Arena.
Matsuzaki-san came to sing "Chihei o Kakeru Shishi o Mita". (Seibu Lions song)
Since then, Matsuzaki Shigeru-san came to our concerts to make important announcements.
Using "Ai no Memory", he became connected to many of our important memories.
Today we want to express our feelings of thanks, no, our feelings of eternal gratitude to Matsuzaki Shigeru-san during this concert.