Question:
On Rosh Chodesh, when barchi nafshi is said, should you also say the the normal shir shel yom?
Answer:
The minhag in E.Yisroel is to do like the Vilna Gaon and only say the shir of Rosh Chodesh, and not the daily one, however there are many other places that say both.
Sources:
Chikrei Lev 1-32, MInchas Chinuch 312.
