I get asked this a lot when someone hums a chorus and can’t place the artist. There are definitely songs called 'Today Is a Good Day' floating around — multiple artists have used that title — so whether there are lyrics depends on which version you mean. Big releases usually have published lyrics on places like 'Genius', the artist’s official site, Spotify’s lyrics feature, or even the YouTube description if there’s an official video.
If it’s an indie or very new track, the lyrics might only exist in the band’s Bandcamp or a social post. Sometimes artists print lyrics in physical album booklets only. I can help track it down: tell me an artist name, a line you remember, or where you heard it (TikTok, radio, a movie), and I’ll point you to the most reliable source or transcribe a short, non-copyrighted excerpt to confirm it’s the right song.
If you want to hunt yourself, search the song title in quotes plus the word "lyrics" and add the artist name if you know it; that usually narrows it fast. I love sleuthing these out — send me whatever clue you’ve got and we’ll find it together.