Twins Music

Amiboshi and Suboshi share the same seiyuu (voice actor) - Ueda Yuuji (上田祐司.)  While Ueda-san also acts as a seiyuu for many other anime series, his most well-known role is that of Sagara Sanosuke from the popular shonen anime series, "Rurouni Kenshin."

Personally, I find the way he sings as Sano very different from the way he sings as Amiboshi and/or Suboshi.  I'm guessing that for the twins, Ueda-san is trying on a more 'child'-ish tone while for Sano, he needs a more masculine and aggressive voice to be convincing.  *smirks*  Amiboshi's solo is probably the mildest out of the three different roles.

Fushigi Yuugi Seiryuu Counterattack Album

• Track #3: Never Get Away [Suboshi's solo vocal]
• Track #7: 夜想曲 (Nocturne) [Amiboshi's solo vocal]

You can find the original Japanese lyrics, the romanized Japanese lyrics, and English translated lyrics on websites such as Anime Lyrics.

I would recommend buying the CD itself, especially if you also like Nakago and Soi. This particular album is mostly composed of Seiryuu Shichieishi vocals (when compared with the others, that is). As for the temporary music files, you can always find them from other websites. Futago no Heya would be a good place to start.