The idea is to go to the page of your number one artist, and follow the link of its number one similar artist, then repeating that for this artist and so on, noting down each artist as you go. Do this until you've got to 50 artists (not including your number one). If you get any repeats, just go to the second similar artist or the nearest one that you haven't already had.
KOTOKO - Yeah, I wouldn't be so into 川田まみ if I didn't look for I've Sound because of her
歌月カオリ - Soft-and-sweet voice princess of I've Sound
Mell - I've Sound Queen of Darkness.
島みやえい子 - SENSEI !!!!
Iku - Pseudo-I've member. under the management of I've Sound but never released anything with I've Sound's label on the jackets.
Love Planet Five - Oh yeah. special unit.
Shiho - not my favorite I've utahime, but she got unique voice.
Healing Leaf - Forgotten Unit.
KOTOKO to 歌月カオリ - OH YEAHHH DENPA UNIT IS LOVE
Outer - PUNKOTOKO LOL
栗林みな実 - Big Boobs Seiyuu.