Description details (artist name) not showing on Twitter

The plugin works fine but when I share a post to Twitter it shows only the title of the post ,image and my sites url..my website is a buddy press website which has people signing up and posting music but when they do share on Twitter the artist name doesn’t appear or isn’t attached to the post…how do I get the artist name on the list like that of soundcloud when shared on twitter?thanks….you can provide me with your mail so that I can vividly show you what I mean,once again thanks