St. Louis Symphony Orchestra | 6,537 followers on LinkedIn. The musical spirit of St. Louis 🎶 | Celebrated as one of today’s most exciting and enduring orchestras, the St. Louis Symphony Orchestra is the second-oldest orchestra in the country. Widely considered one of the leading American orchestras, the Grammy® Award-winning SLSO maintains its commitment to artistic excellence, educational impact, and community collaborations—all in service to its mission of enriching lives through the power of music.