If all else fails, join Tamil music fan groups on Reddit or Telegram. Ask: "Has the official Soolam theme been released on Spotify yet?" Do not ask for pirated links.
Search for or "Soolam BGM" on YouTube. Channels like Saregama Tamil , T-Series Tamil , or the TV network’s official channel often upload high-quality versions. You can then use YouTube Music’s download feature (paid) or a legal YouTube to MP3 converter that respects copyright (use only if the video is royalty-free—most are not). soolam serial mp3 song download masstamilan new