Век живи...
Оказывается, в Хабаде не читают Шир аШирим в шабат холь-аМоэд Песах (и, как я понял, Коэлет в Суккот и(?) Мегилат Рут в Шавуот).
В тырнетах по этому поводу пишут:
I found an answer by the Rebbe to R Uriel Tzimer (3 Sivan 5717), where he says that (1) the Mechaber in Shulchan Aruch does not bring this Obligation, (2) those who bring this Halcha sya it is only a "Min'hag Be'alma", (3) THe Mishan in Shaboss begining of Perek 16 says that "Kesuvim should not be read on Shabos", (4) Yerushalmi Megilah (3,5) says that bexause of that Mishna we do not read Esther on Shabat.

http://gershtn.com/Item.aspx?Id=66
Моадим леСимха!
upd:
( שיר-השירים )
http://chabadlibrary.org/books/default.aspx?furl=/chasidim/otzar/10/6/19
В тырнетах по этому поводу пишут:
I found an answer by the Rebbe to R Uriel Tzimer (3 Sivan 5717), where he says that (1) the Mechaber in Shulchan Aruch does not bring this Obligation, (2) those who bring this Halcha sya it is only a "Min'hag Be'alma", (3) THe Mishan in Shaboss begining of Perek 16 says that "Kesuvim should not be read on Shabos", (4) Yerushalmi Megilah (3,5) says that bexause of that Mishna we do not read Esther on Shabat.

http://gershtn.com/Item.aspx?Id=66
Моадим леСимха!
upd:
( שיר-השירים )
http://chabadlibrary.org/books/default.aspx?furl=/chasidim/otzar/10/6/19