Please list the timbre characteristics of several musical instruments.

Double bass and cello are bass instruments with deep and rich timbre; Viola is a alto instrument with a soft and mellow tone; Violin is a high-pitched instrument with beautiful and lyrical timbre and rich singing. The flute is lively and suitable for expressing smooth melody. Piccolo is a supplement to the flute range and is called "coloratura soprano" in the band. Clarinet and oboe are alto instruments in woodwind group, which are slightly similar in appearance, but the whistle of clarinet is a single spring, which is suitable for playing lively and smooth melody. The oboe timbre is slightly hoarse, showing lyrical melody and gentle emotion. Bassoon is a bass instrument in woodwind group, with deep and heavy timbre. French horn, also known as French horn, has a mellow and charming tone, which is the connection between woodwind instruments and brass instruments. The trumpet is bright and brilliant, suitable for expressing summoning melody; Trombone, also called telescopic tube and pull tube, is suitable for playing a melody similar to a horn; Tuba is low and heavy.