We all know that Taeyeon can sing and she perfectly displayed it in her song "I". I love both of the music and video, But... I think I prefer "Rain"- just slightly. Taeyeon seemed to have stray away from Girls' Generation's bright and cute image and showed us a beautifully dark and artistic music video. Like Taeyeon when she isn't with the other members. I loved how the song was put together, the r&b vibe with a hint off jazz that complimented Taeyeon's beautiful voice. (do correct me if I am wrong about anything)