Ani hu ha-sho'el (Hebrew: אני הוא השואל, literally 'I am the one who asks') is a Selicha piyyut for Yom Kippur; in most rites, but not all, it is (or was) recited in the Musaf service.
[1] It is composed by Rabbi Baruch ben Samuel of Mainz.
In many communities, it is recited aloud by the Hazzan with a moving melody.
[2] The selicha is included in the liturgy of most of the printed Western Ashkenazic Selichot rites.
Once in Avraham Meir Habermann [he]'s edition of the piyyutim of Rabbi Baruch of Mainz,[6] and a second time in Daniel Goldschmidt's edition of the Yom Kippur Machzor.