Appears on releases
| # | Title | Length | Track artist | Release title | Release artist | Release group type | Country/Date | Label | Catalog# |
|---|---|---|---|---|---|---|---|---|---|
| Official | |||||||||
| 1.6 | 心の声 | 4:13 | SEAMO featuring AZU (from R) | Live Goes On | SEAMO |
| BMG Japan | BVCR-11092 | |
| 1.15 | 心の声 | 4:13 | SEAMO feat. AZU | Best Of SEAMO | SEAMO | Album + Compilation |
| Ariola Japan (Japanese label, rebranded from the entirety of BMG Japan in June 2009) | BVCL-34 |
| 3.1 | 心の声 | 4:13 | SEAMO featuring AZU | BEST (初回生産限定盤) | AZU | Album + Compilation |
| Ariola Japan (Japanese label, rebranded from the entirety of BMG Japan in June 2009) | BVCL-433, BVCL-434, BVCL-435 |
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