The tone produced by suona is loud, piercing and uplifting, thus it is usually used to perform vibrant and lively pieces. However, its repertoire also includes some mellower pieces. The suona is commonly used as an accompaniment in the Chinese opera, singing or dancing, but also for more sombre occasions, such as during a traditional Chinese funeral procession. It is also utilized in solos or ensembles for various occasions and ceremonies. Being a double-reeded wind instrument, it is extremely difficult to master it to produce perfect pitches. There are modified types, such as the keyed alto, tenor and bass suonas. Many Suona players are also now doubling on Guan, a double-reed Chinese instrument of much mellower quality (like that of the clarinet.) This usage has also led to the development of keyed lower Guan, such as the Zhongyin and Diyin Guans. The instrument first appeared in the Wei and Jin period (200-420).