When Tisha B'Av falls on a weekday there are liturgical changes, plus (I've been taught) we refrain from singing in favor of just reciting, and we sit on the floor (as in mourning). When Tisha B'Av falls on Shabbat we defer the fast and reading Eicha. Do we make any changes to content or execution of the services on Shabbat (kabbalat shabbat, shacharit, mincha)? Or is it a regular Shabbat as far as services are concerned?
I'm aware of this question about Shabbat restrictions on Tisha B'Av, but I think that's asking for something different.