Skype launched in 2003 and became one of the first widely used apps for free voice and video calls over the internet, before Microsoft bought the service in 2011. Its Windows desktop client used a family of soft electronic sounds for signing in, calling and receiving messages, which millions heard daily at home and in offices. As platforms shifted, many users moved to a Discord call or compared the chime to a Discord notification, yet the Skype login cue stayed memorable. Microsoft retired Skype in May 2025, which has only increased its use as a nostalgic reference online.