Lǐ Gài 李概 (fl. mid-sixth century), a Northern Qí 北齊 phonologist. Suí shū jīngjí zhì 隋書‧經籍志 records his Yīn pǔ 音譜 (KR1j0112) in four juàn — a phonological compendium in the Shēng lèi / Yùn jí lineage that contributed to the development of the rhyme-book tradition immediately preceding the Suí Qièyùn (601). The Yīn pǔ was lost in the Sòng; surviving fragments are preserved chiefly in Buddhist yīnyì literature and in Guǎngyùn citations; reconstructed in CHANT. No biography in any standard history. CBDB has no matching entry.