Is there a good online or downloadable utility that will tell me what chord a group of notes make? What chord is this? C# D F# G C What about this? C# D F# G C Bb I mean, I know that the first chord has a minor 2nd, a perfect fourth, a dimished or flat 5th, and a major 7th, but have no idea what the chord name is. Is it C#min2sus4-5maj7, or something else? Would the addition of a Bb add a flat 15, or what?