魁 is one of the most commonly used Japanese kanji, and it also has a lot of special readings in addition to the standard onyomi and kunyomi readings.
ONYOMI 音読み
さきがけ sakigake かしら kashira
KUNYOMI 訓読み
カイ kai
Examples
クロッカスは春の先駆けである。The crocus is a forerunner of spring.海洋研究の歴史の先駆けとなったのは、探検のための航海だった。Voyages of exploration were the earliest in the history of studying the ocean.