1) Music Video by Atmosphere: This video is not officially available on platforms such as YouTube or Vimeo. One can find user-uploaded copies of the music video on DailyMotion and other similar platforms.
2) Music Video by Sugarland: This music video is available on both YouTube and Vimeo, as well as on the official website of Sugarland.
To watch the videos online, one can simply search for "Sitting at a Bar" followed by the artist name on these platforms or on any major search engine. It's important to note that, the availability of music videos online may vary depending on location and streaming rights, so it's always best to check the official sources or reputable streaming platforms to ensure accessibility.