Here is the song's lyrics:

Bridge: If I didn't know better, I'd love you Still I don't want to

Overall, "If I Didn't Know Better" is a timeless classic that showcases Luther Vandross's incredible vocal talent and songwriting skills. Whether you're listening to the original version or a remastered MP3, this song is sure to bring a smile to your face and a touch of soul to your day.

As for the 21st MP3 better version, I'm assuming you're referring to a remastered or re-released version of the song. In recent years, many classic songs have been re-released in high-quality formats, including MP3s. These new versions often feature improved sound quality, making them sound fresher and more vibrant than the original recordings.