Top Ten Voice-Leading Errors

More than an octave between the tenor and alto or between the alto and soprano

Often caused by not moving upper voices in contrary motion to the bass in the IV-V progression

You need to manually raise the leading tone in minor keys

Doubling something other than the root for root position triads--particularly problematic if the leading tone is doubled.

Voices that leap a lot when they could move by step to a different chord tone -- often causes other errors.

Chordal 7ths should resolve down. Leading tones in the soprano must resolve up.

You need a third in every chord. Don't leave this out.

Tenor going way too low, usually.

Make sure you are spelling the chord right!