Many sites, such as the Free Music Archive or Jamendo , offer legal free MP3 downloads.
The song "I Got You (I Feel Good)" is often sought after in MP3 format. Feel So Good Mp3
To make sure I find the exact file or article you are looking for, could you clarify: Is it the classic jazz-fusion song by Chuck Mangione ? Or a different song, perhaps a newer hip-hop or rap track? Many sites, such as the Free Music Archive