Is it permissible to interrupt the blessings of Shema (Birchot Kriat Shema) to recite piyyutim (liturgical poems)?

PrayerBirchot Kriat Shema

Synopsis

Authorities debate whether inserting piyyutim within the blessings surrounding Kriat Shema constitutes a forbidden interruption. The Mechaber discourages the practice; the Rema permits it based on widespread Ashkenazi custom.

Early Acharonim
Late Acharonim
Lenient
Strict
Lesser cited
Major authority

Discussion

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