KinKi Kids 29th Single "Swan Song"

Are they listened to our wishes?
CDJapan announcement;

Swan Song (スワンソング)

Limited Edition
Catalog No.: JECN-203
Label/Distributor: Sony Music Entertainment
Format: CD
Number of discs (or other units): 1
Release Date: 2009/10/28

Twenty-ninth single release from KinKi Kids featuring the lyricist Takashi Matsumoto*. Limited edition includes bonus tracks "Shinku no Hana" and "Swan Song - Backing Track." Features alternate jacket.

Track list:
1. スワンソング
2. サマルェカダス ～another oasis～
3. 深紅の花
4. スワンソング - Backing Track -


Regular edition
Catalog No.: JECN-204

Twenty-ninth single release from KinKi Kids featuring the lyricist Takashi Matsumoto. Regular edition includes bonus track "Omokage." Features alternate jacket.

Track list:
1. スワンソング
2. サマルェカダス ～another oasis～
3. 面影

note:
About Takashi Matsumoto (松本隆): here.
Wikipedia wrote: The songs "Garasu no Shounen"(硝子の少年), "Hakka Candy"(薄荷キャンディー), and "Boku no senaka ni wa hane ga aru"(ボクの背中には羽がある) of the KinKi Kids are some of his notable recent work.

When I read the title 'Swan Song'. I'm curious about the lyric, what the song is all about~.
But it could be just a phrase or idiom (as others said)
A little unexcited I feel is probably because of the marathon releases from KinKi and their each solo works?^^' *saving saving*

♣