As warm music is to evoke a particular mood, and not defined by its specific sound, there can be very different types of songs that a listener might call warm. This could be within niche music that others may find more difficult to access, such as electronic music with prominent soothing bass, or in complex jazz that is sharing a joyful experience.
However, in more popular culture, it is very mainstream songs by world famous artists that are most commonly referred to as warm. Typical examples include Coldplay, Adele and Ed Sheeran, with songs that use instrumentation such as piano, content about love, a slower pace, and are unchallenging yet relatable to the listener. In this context, warm music could be because of its comforting effect.
There are also singers whose voices regularly fit this description, in particular in soul music and swing music. Al Green and Sam Cook's smooth vocal in the former, and Frank Sinatra and Tony Bennett's deep baritone in the latter, are notable examples of emitting a sound that evokes warmth.
Due to music's power to affect on an emotional level, movie soundtracks that are aiming for this feeling are filled with warm songs. This is particularly prevalent in romantic films and rom-coms. Examples of this method being used are Unchained Melody in Ghost, Love Is All Around from 4 Weddings and A Funeral, and The Time Of My Life in Dirty Dancing.
Whilst they are all of a certain generation, this has happened for decades before and continues to do so today. The common theme of many of these warm songs are a relatable sad backdrop being turned into positive love and a happy ending.