For curated "Best of" collections and high-fidelity audio, these official platforms allow for legal downloading (often requiring a subscription or per-song purchase):
One of the most official sources for downloading Ilayaraja's MP3 and HD songs. They offer specialized albums like "Ilayaraja Tamil Special" and "Melody Hits of Ilayaraja".
"Get Ready to Groove: Download Ilaiyaraaja Songs Collection Zip File"
: This is a top choice for fans. You can buy individual songs for as little as ₹4 (MP3) or ₹10 (HD), allowing you to curate your own high-fidelity "zip" collection safely.