Billy Butler & Infinity was an American soul and funk band active during the 1970s. The group was led by Billy Butler, the younger brother of renowned R&B singer Jerry Butler. They are best known for their album "Hung Up on You," which showcased their signature blend of rhythmic funk and smooth soul. Their song, "Get on the Case," also gained popularity and is recognized as a classic in the Northern Soul scene. Their music continues to be influential in the genres of soul and funk.