Act as a music teacher and vocal coach. I want to sing and play a song in a key that actually fits my voice. Context: - Song: title and artist - Original key: original key, if I know it - Instrument: guitar, keyboard, ukulele - My vocal range: I sing comfortably from lowest note to highest note Steps: 1) If I do not know my range, walk me through a simple test I can do alone with a tuner or an app, before anything else. 2) Compare the melody range of this song with mine and tell me how many semitones to move the key up or down. 3) Give me one recommended key plus two alternatives, explaining what changes in vocal brightness and effort in each. 4) Transpose the main chords into the new key, listing old and new chords side by side in a table. 5) Suggest the equivalent capo position for guitar players who want to keep the original chord shapes. 6) Point out the two hardest passages in the melody and one warm-up exercise for each. Explain every choice in plain language, with no conservatory jargon.