举凡【jǔfán】

举凡 opens a sentence by naming a range – a list, or a phrase for a whole class – and the main clause says what holds for every item in it. It's written only: essays, prefaces, introductions to a person or a field, and formal notices.

A list or a category

After 举凡 comes either examples separated by 、, which read as "everything from A to C", or a phrase naming the whole class, often ending in …的事, …的人 or …事项.

The main clause needs an "all" word

The main clause closes the sweep with 都, 均, 皆 or 无不, or with a word that already means "every", such as 样样.

• × 举凡古典音乐、爵士、摇滚，他喜欢 → 举凡古典音乐、爵士、摇滚，他都喜欢

凡是 does the same job in plainer writing and has its own point. 举凡 adds a sense of range, as if counting off the items.