VIOLINIST Takako Nishizaki and the Hong Kong Chinese Orchestra will perform the most popular Chinese violin concerto, ''The Butterfly Lovers'', in a music showcase at the Hong Kong Cultural Centre and the Tsuen Wan Town Hall Auditorium in mid-January. Takako Nishizaki has been awarded more than seven gold and platinum discs in Hong Kong and Taiwan for her recordings of ''The Butterfly Lovers Concerto'' and other recordings of Chinese music for violin and orchestra. ''A Gift of Music'' concert series will be staged at the Cultural Centre Concert Hall on January 15 and 16 and in the Tsuen Wan Town Hall Auditorium on January 17 at 8 pm. Tickets ranging from $40 to $90 are available at all URBTIX outlets. Reservation of tickets can be made on 734-9009.