This Shabbat we read Parshat Ha'azinu which is also known as "Shirat Ha'azinu."  The way this Parsha is written in the Torah together with its rich content give it the characteristic of a song or a poem.  Often this portion is studied in Yeshivot while teaching the many deep meanings that are found in the rich text.

On a more homiletic note, I think it makes sense to read this Parsha immediately following Yom Kippur.  We have just come down from the elated state we all attained on the holiest day of the year.  We were all there and we all felt it.  Perhaps it is anti-climactic  for us to engage in any other activities following Yom Kippur.  How can we top that feeling? Furthermore, there is the threat that maybe the thought of another Shabbat and another eight or nine days of Yom Tov may send us in a tailspin that could have deleterious effects on our spiritual well being. 

The antidote is given to us before our very eyes.  Sing! Celebrate all that we have to be thankful for. Rejoice in the triumphs of our people despite the highly stacked odds against us.  If we do sing Shirah, then we can go into Sukkot and appreciate her main motif of "Zeman Simchateinu" - the time of rejoicing.  Ha'azinu is what allows us to celebrate Sukkot the way it deserves to be celebrated.

Shabbat Shalom and Chag Sameach.