"Red Cliff Ode" is an important prose by the ancient Chinese scholar Su Shi, with strong emotional connotation and musicality. The following are some pieces suitable as background music for reciting "Red Cliff Fu":

1. Guqin music "Mountains and Flowing Water": This piece has a beautiful melody and slow rhythm, which can well reflect the magnificence of Red Cliff described by Su Shi. The scenery also shows the profound humanistic connotation in the article.

2. Guqin music "Three Plum Blossom Lanes": The melody of this piece is simple and elegant, which can be used to set off Su Shi's meditation and inner emotions in Red Cliff.

3. Guzheng song "Autumn Moon in the Han Palace": This piece has a sad melody and a deep nostalgic emotion, which is very consistent with the Chinese theme of joys and sorrows in "Red Cliff Fu".

4. Guqin music "Goose Falling on the Flat Sand": The melody of this piece is quiet and deep, which can well express Su Shi's loneliness and contemplation in Red Cliff.

5. Erhu piece "Two Springs Reflect the Moon": This piece has strong sadness and deep emotions, which complements Su Shi's emotion about the short life and the long history in "Red Cliff Fu".

Please note that these music are recommendations of traditional Chinese music, so when playing, please make sure that your device or platform’s music library has these tracks. If these pieces don't meet your needs, you can also try other music with classical Chinese characteristics, such as pipa, dizi, etc.