I also have a poor ear which becomes super obvious when I'm doing transcriptions or jamming on tunes I don't know. Despite that, I've been gigging steadily for four decades so my ears have improved to some extent over that time.
1. I can tell when the chord has changed
2. I can differentiate between major and minor chords, although diminished and augmented chords still trip me up, mainly because I haven't played enough music that makes use of them. The upper extensions (9ths, 13ths) elude me, but for bass lines sticking to triads and 7th chords always works
3. I can immediately pick out most common chord progressions and variations of them, like blues, "rhythm changes" and any number of basic rock progressions.
4. I can pick out common repetitive bass lines. Complex lines whether it's Phil Lesh, prog, fusion or jazz I can't pick up without some amount of transcription.
When I do normal ear training exercises, I also score poorly. On the other hand, when I get into a transcription frenzy after a few days I start hearing things more easily. I can sing things I've heard but I can't always identify the intervals and chords without sitting down and transcribing what I sung. Where I tend to get lost but have slowly started to get better at is chord substitutions, like secondary dominants, parallel minors, tritone substitutions (don't get all excited if you have no idea what those are).
Ever wonder why classical musicians do so much ear training if they are always going to read off a score? I personally think doing transcription is a more important form of ear training than doing ear training exercises. It's certainly of more use in the short term
Whether it's transcribing tunes needed for an upcoming gig or picking out songs or sections of songs where I hear something cool and want to figure out what it is, I pick out the notes and put them on paper. Then I analyze the notes to learn what is happening. The more of this I do, the more I start hearing these "new" combinations of notes being used and now it's in my toolbox to pull out if and when it's needed.
The biggest lesson of transcription for me: most bass lines are much simpler than you think at first listen.
1. I can tell when the chord has changed

2. I can differentiate between major and minor chords, although diminished and augmented chords still trip me up, mainly because I haven't played enough music that makes use of them. The upper extensions (9ths, 13ths) elude me, but for bass lines sticking to triads and 7th chords always works

3. I can immediately pick out most common chord progressions and variations of them, like blues, "rhythm changes" and any number of basic rock progressions.
4. I can pick out common repetitive bass lines. Complex lines whether it's Phil Lesh, prog, fusion or jazz I can't pick up without some amount of transcription.
When I do normal ear training exercises, I also score poorly. On the other hand, when I get into a transcription frenzy after a few days I start hearing things more easily. I can sing things I've heard but I can't always identify the intervals and chords without sitting down and transcribing what I sung. Where I tend to get lost but have slowly started to get better at is chord substitutions, like secondary dominants, parallel minors, tritone substitutions (don't get all excited if you have no idea what those are).
Ever wonder why classical musicians do so much ear training if they are always going to read off a score? I personally think doing transcription is a more important form of ear training than doing ear training exercises. It's certainly of more use in the short term
Whether it's transcribing tunes needed for an upcoming gig or picking out songs or sections of songs where I hear something cool and want to figure out what it is, I pick out the notes and put them on paper. Then I analyze the notes to learn what is happening. The more of this I do, the more I start hearing these "new" combinations of notes being used and now it's in my toolbox to pull out if and when it's needed.
The biggest lesson of transcription for me: most bass lines are much simpler than you think at first listen.