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Many have a custom not to say the Shir Shel Yom or Ein Kelokeinu on Tisha BeAv morning.

Why not?

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Doesn't Chabad kick it up until Minchah? I know that Ashkenaz moves shir shel yom until Minchah. – Noach MiFrankfurt Aug 4 '14 at 0:46
@NoachmiFrankfurt yes. Why? – Shmuel Brin Aug 4 '14 at 4:36
Should we interrupt our aveilut? I have always thought that we postponed those portions because shsh"y is from the Bet HaMikdash and the ketoret was offered there. Of course we say korbanot in birchot hashachar, which seems to also be problematic. – Noach MiFrankfurt Aug 4 '14 at 4:39
@NoachmiFrankfurt - For that matter, you might be able to place the same argument / logic on why we say "Mizmor L'Todah" on Tisha B'Av. I think there's a difference between reciting the portion of the Korbanot, itself, as this was the actual service itself, vs. "Shir Shel Yom" which is "peripheral" to the service. Have to research En K'Eilokenu, as IDK the original concept of how that entered the davening in the first place. – DanF Aug 4 '14 at 16:47
@DanF, exactly the problem I pointed out in my theory. I still think that whatever of the later (re-)additions to the siddur could be removed are. Mizmor l'Todah is, if I recall correctly, in the siddur of the Rambam. I don't believe that either e"k or shsh"y are, however, bli neder, I will check my geonic and rishonic references before the taanit to support my argument – Noach MiFrankfurt Aug 4 '14 at 17:23

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