Davie504 is the online alias of Italian musician and YouTuber Davide Biale who is the most subscribed Italian YouTuber with over 12 million subscribers on his channel on which he uploads videos of himself playing bass guitar, primarily with a slapping technique. He makes unconventional videos and has used M&M's to cover songs by Eminem, corn cobs to play a Korn medley and actual chili peppers for a Red Hot Chili Peppers medley. He also likes to make challenge videos and has videos of him playing bass on guitars with 15, 24, 36 and 69 strings, as well as one with no strings. He has a meme reviewing series called SDAIAY (Some Days Ago I Asked You) on which he reviews memes made by fans on his own subreddit page, r/Davie504. Even though he often makes sarcastic videos about slap bass, it is actually his favorite technique to play bass, and he considers it to be the most suitable for making YouTube videos because it is easy to hear on any kind of speaker. The number in his username refers to his birth date 5th April. He calls his fans the "slappers".