グラスレ (grass thread, yunisan) is a somehow up to date (you can find some recent info for some bands) data base about visual kei bands.
Visual kei bands are usually not only short‐lived but are also constantly changing members for the most part.
Visual kei artists jump from ex‐bands to new bands while of course changing their artist names regularly.
Such database is then very handy to trace of those movements as official communications rarely mention ex‐members to say the least.

They mostly cover visual kei bands but they also have some HR/HM bands too (hardrock/heavymetal).

grass thread has Artist and Label type page (examples 陰陽座 and EXTASY RECORDS).