Can I use a Concorde cartridge on my straight-arm turntable?

First of all, straight arm DJ turntables are designed strictly for sheer groove-holding capability, and not for fidelity.  Harmonic distortion on a short, straight tonearm will increase by double, which can limit the effectiveness of any great sounding cartridge, regardless of manufacturer.  Using a Concorde cartridge will work fine, granted that is a spherical stylus.  It should be noted that an elliptical stylus will likely not sit properly within the groove, and may result in unbalanced sound reproduction on this type of tonearm.