According to an article on , some of the best songs for Instagram reels in 2021 include "Cold Heart" by Kaluma and Stephanie Schulte and "Can we skip to the good part?" by Emma Steinbakken. Adding popular and trendy songs to your Instagram Reels can help your content go viral and attract more followers. To add music to your Reels, you can either browse through Instagram's music library or use your own original audio. When creating a Reel, you can select the audio option and search for a specific song or browse through different categories such as popular, trending, and moods.