"Otherside" is one of the band's most critically acclaimed tracks, known for John Frusciante's haunting, minimalist guitar riff and Anthony Kiedis’s vulnerable vocals regarding addiction.
This is considered "radio quality" and is significantly lower than the modern standard of 320kbps or lossless formats (FLAC). You will likely notice a "flat" sound, lack of depth in the bass, and some "swishing" artifacts in the cymbals.
RAR is a common compression format used to reduce file size or bundle multiple items together. You will need a utility like WinRAR or 7-Zip to open it. Artistic Review (The Song)