All of the official H!P groups have been tagged with "hello project groups".
There are two subprojects within H!P:
- Hello! Project Eggs (tagged with "hello project eggs")
- Hello! Project Kids (tagged with "hello project kids")
Also, the shuffle units have been tagged with "hello project shuffle units".
All of the members of H!P should have now been linked via relationships.
There have been a number of one-off collaborations which weren't recognised as an official group. Many of these really need support for multiple artists per track. They have been tagged with "hello project random collaborations".