All Music by Falcom Sound Team jdk (Hayato Sonoda, Takahiro Unisuga,), with outsourced work by Yukihiro Jindo and Mitsuo Singa.

Composer breakdown leaked by an anonymous user with ties to Falcom: https://www65.atwiki.jp/falcom_staff/pages/141.html

Hayato Sonoda (Disc 1: 2, 3, 8, 9, 10, 11, 12, 13, 14, 16, 17, / Disc 2: 1, 2, 3, 6, 10, 13, 14, 15, 17, 18, 19, 20, 21 / Disc 3: 1, 2, 6, 8, 9, 11, 17, 22, 24, 25)
Takahiro Unisuga (Disc 1: 4, 5, 6, 15, 18, 19, 20 / Disc 2: 4, 5, 8, 12 / Disc 3: 4, 5, 21)
Yukihiro Jindo (contractor) (Disc 1: 1 / Disc 2: 9, 11 / Disc 3: 3, 7, 10, 14, 18)
Mitsuo Singa (contractor) (Disc 1: 7 / Disc 2: 7, 16 / Disc 3: 12, 13, 15, 16, 19, 20)

Arrangement:
Hayato Sonoda (Disc 3: 23, 26)

Notes:
• D3-15~20 are the new tracks added to the PS4 version (Append Music Collection), D3-21~22 are unused tracks, D3-23~26 are jingles.
• Kosuke.F appeared on the PS4 port and only performs for Singa. This means he could have only performed D3-15, the only new track that uses real guitar performance.
• D3-23 was originally composed for Ys Eternal (1997), its real composer remains still unknown.
• D3-26 was originally composed by Yuzo Koshiro for Ys I.

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Original album credits from the booklet:

Violin : Akiko Nagano / Mariko Ito
Cello : Takanori Yamagishi
Guitar : Akihiro Goto / Terukazu Inoue / Kosuke.F
Bass : Atsushi Enomoto / Kohei Wada
Recording Engineer : Koki Tochio
Assistant Engineer : Kazumi Iwano / Tetsuya Matsuda / Yukihiro Jindo
Recorded at branch studio