There are two bands with the name 4am. 1)
4am is a Jazz Trio from Darmstadt, concisting of Steffen Stütz (Piano), Wolfgang Ritter (Bass) and Marco Bruckdorfer (Drums). They often work together with Nathalie Schäfer for example under the name Nekta. Furthermore Wolfgang Ritter is one of the best bassists in Germany and he plays/played also in other Bands for example Tobsucht, Paddy Goes to Holyhead or Thomas Anders Band. 2)
4am is a colombian rock project created by Augusto Tamayo in 1999.