This was one tight band. But, in an early instance of Zappa's doctoring of live material, "Roxy & Elsewhere" is partially a studio effort. Napoleon Murphy Brock's high vocals in "Cheepnis" are proof of this.  Further proof would be Volume Two of "You Can't Do That On Stage Anymore."  Vastly different arrangement, with no speeded-up vocal. The other instances are more subtle, but present, nonetheless. But I won't detract from this record. It really is good.