This isn't usually a song you download to listen to for fun; it’s a specific television moment used for mourning. If you want to listen or download:
For the standard (non-silent) high-quality versions, you can find the Fantástico themes on Spotify or Apple Music under "Rede Globo" or "Guto Graça Mello." This isn't usually a song you download to
Historically, the show ends with an upbeat, synth-heavy instrumental. However, when a major public figure passes away, the show famously ends in absolute silence or with a very somber, slowed-down orchestral version as a mark of respect. Be careful with sites like the one in your prompt
Be careful with sites like the one in your prompt. They often use "clickbait" titles for SEO and may lead to broken links or malware. the show ends with an upbeat
If you are looking for a of that iconic theme, The "Fantástico" Closing Theme
Search for "Encerramento Fantástico Luto" or "Fantástico em Silêncio." Many archivists upload these specific broadcasts.