选择晚会背景音乐的开场音乐时，通常要考虑以下几个因素：节奏感、欢快的旋律、轻松愉快的氛围。以下是一些适合作为晚会背景音乐开场音乐的推荐：
1. "Celebration" - Kool & The Gang
2. "Happy" - Pharrell Williams
3. "Don't Stop 'Til You Get Enough" - Michael Jackson
4. "Walking on Sunshine" - Katrina and The Waves
5. "I Gotta Feeling" - The Black Eyed Peas
6. "Uptown Funk" - Mark Ronson ft. Bruno Mars
7. "Can't Stop the Feeling!" - Justin Timberlake
8. "Dancing Queen" - ABBA
9. "We Are Family" - Sister Sledge
10. "Good Vibrations" - The Beach Boys
这些歌曲都具有积极向上的节奏和旋律，适合为晚会热身并营造欢快的气氛。请根据自己的喜好或晚会的主题进行选择。
