"Accompanying a Singer" by Per Danielsson from the "Creative Keyboard" online magazine.
http://www.melbay.com/creativekeybo...companying.html "When playing with a singer you will most likely encounter rubato introductions or entire songs that are performed rubato. This skill is perhaps the hardest to learn, but when mastered, sets the good accompanists apart from the mediocre.
1) Following: Most singers usually have a planned out stylistic approach and it’s your job to follow him or her. Some singers want the accompanist to strictly follow their phrasing, which requires you to hear the singer first. In other words, the accompaniment will be slightly behind the singer, but if you are attentive and respond quickly this delay will sound natural. Keep in mind that the singer is in charge and it’s the accompanist’s job to follow.
2) Lead the way: Sometimes you will experience singers who are waiting for the accompanist to start phrases. Do not hesitate to start phrases and take charge. The singer is waiting for you! When using this approach it is important to be clear in setting up beginnings of phrases so you do not confuse the singer. Sometimes it is also helpful if the accompanist emphasizes the starting pitch, but make it a part of the set-up so it doesn’t become too obvious to the audience.
3) Exact accompaniment: This is when the rhythm and phrasing of the vocalist and accompanist is played exactly together. A rehearsal is recommended to achieve this difficult task unless you are very familiar with the singer’s style. Do not hesitate to write out a lead sheet in order to be consistent with the comping of a certain tune. "