Given the uncertainty, the safest approach is to address both possibilities briefly and focus on L'Arc~en~Ciel since it's a more plausible fit with a 20th anniversary around 2014. Then suggest ways to find their music legally. Also, mention that if the user is referring to a different "Arc en Ciel" project, they should verify the correct name and seek information accordingly.
: Featured hits from the later part of their career, including "READY STEADY GO," "Link," and "CHASE". Physical Media : If you're a collector, the 20th L'Anniversary LIVE -Complete Box- includes both days on DVD/Blu-ray. L'Arc-en-Ciel for their upcoming tours instead? 20th L'Anniversary LIVE -Day1 - L'Arc-en-Ciel l27arc en ciel 20th anniversary mp3 download link
It featured iconic hits like Nijitsu , Honey , and Ready Steady Go . Given the uncertainty, the safest approach is to