Watch the Minor 7 Flat What?! online guitar lesson by Angus Clark from 50 Radio Rock Licks You MUST Know
Every now and then you get called by that songwriter who actually learned some chords, or the songwriter hired an arranger that knows some chords, or you wrote the song and weren't really sure what that chord was called but it was the only one that fit. End result is the same, you need to figure out what to play over a minor 7 flat 5 chord. Don't bother learning a new scale or even worse learning what it's called, just arpeggiate the chord, you'll know you're playing the right notes. For the rest of this phrase listen to which chord tones the melody is hitting vs. the progression under it - and keep those bends in tune!