Prof. William S-Y. Wang, an eminent linguist, has made significant contributions to the field regarding lexical diffusion, experimental phonetic studies, language simulation and modeling, and aging and language. To celebrate his 90th birthday, colleagues and friends worldwide have contributed over 30 articles to a two-volume Festschrift. The English volume includes topics such as Chinese language evolution, the relationship between language and music, and the brain processes involved in language production. This Festschrift is written by and for experienced language researchers and is also suitable for students of Chinese linguistics and those interested in Chinese culture, history, and neurology.