Push:
A syncopated rhythm where a note or chord occurring on an "upbeat" is tied to a note on the downbeat. For example, a chord played on the "and" of 2 is tied over to a half note on beat 3. Such a push can be notated as follows in a rhythm chart:



Efficient Voice Leading:
The practice of moving the shortest distance possible between the notes of successive chords. Any common tones between chords are retained, and non-common tones in the current chord move to the nearest possible chord tone in the following chord. If you are playing a progression from a C major triad to an F major triad, for example, the C would be held as a common tone. The E would move to an F, and the G would move to a G.

4 over 5:
A chord often used in contemporary music as a substitute for a dominant 7 (V7) chord. It's created by playing the IV chord in the key over the 5th note of the scale. For example, in C major, a 4/5 would feature an F major triad played over a G in the bass. In the key of Eb, a 4/5 would be an Ab major triad over a Bb in the bass.

sus chord:
When "sus" appears after the letter name of a chord, omit the third of the chord and play the fourth instead. To find the fourth, count four scale degrees up from the root. This chord is also represented as a sus4 chord.

sus4,2 chords:
Sometimes you'll see "sus4,2" or "4,2" after a chord's letter name. Omit the third, and play the fourth and the second above the root.

7sus chords:
When "7sus" appears after the letter name of a chord, create a "sus" by omitting the third of the chord, and playing the fourth instead. Then add the 7th above the root.