萨克斯手在即兴表演时不断重复着几个音符，创造出了独特的爵士韵味。

The saxophonist kept ___riffing on a few notes during the improv, creating a unique jazz vibe.

乐队成员在舞台上即兴演奏，相互配合创造出美妙的音乐。

The band members were ___riffing off each other on stage, creating amazing music together.