Frontier Works, Inc. is a Japanese company that is most known for distributing anime-related products, but also produces compilation CDs of utattemita. It has two series of CDs:
- Utattemoratta (歌ってもらった), meaning "received the singing of", is series that has a certain theme for each CD and features utaite who are well-known for that particular theme.
- Sengoku BAND (戦国BAND) is a series of CDs that portray utaite as samurai.
For a full list of collaboration albums in a sortable table, please see here.