I noticed that Pony Canyon is only credited as "販売会社" (distributor) on PCXE releases, so I went ahead and moved them to distributor on such releases
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Seiren:
https://vgmdb.net/album/68710 https://vgmdb.net/album/68711
K-ON!!:
https://vgmdb.net/album/84367 https://vgmdb.net/album/84368
Sakura Trick:
https://vgmdb.net/album/47679
Photokano:
https://vgmdb.net/product/4079
Publisher/Manufacturer: TBS (Tokyo Broadcasting System Television, Inc.)
"Made by Tokyo Broadcasting System Television, Inc."
https://vgmdb.net/db/covers.php?do=view&cover=206231
https://vgmdb.net/db/covers.php?do=view&cover=349724
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Seisen Cerberus ~Ryuukoku no Fatalité~:
https://vgmdb.net/album/59423
Publisher/Manufacturer: TV TOKYO Corporation
HAL:
https://vgmdb.net/album/41574
Publisher/Manufacturer: SHOCHIKU Co.,Ltd
GARO -DIVINE FLAME-:
https://vgmdb.net/album/61985
Publisher/Manufacturer: TOHOKUSHINSHA FILM CORPORATION
Giovanni's Island:
https://vgmdb.net/album/52106
Publisher/Manufacturer: 一般社団法人 日本音楽事業者協会 (JAME / Japan Association of Music Enterprises)
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Tamako Market:
https://vgmdb.net/product/2576
"MADE BY PONY CANYON INC. JAPAN" so no change
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These entries already had Pony Canyon linked as distributor
SHOW BY ROCK!!
https://vgmdb.net/product/4499
Publisher/Manufacturer: FuRyu Corporation
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Tsurune:
https://vgmdb.net/product/6573
Future release, but I assume it'll be manufactured by Pony Canyon like Violet Evergarden.