RecruitingBehavioural interventionAmplification of Positivity for Alcohol UseThe proposed study consists of two phases. During Phase 1, the investigators will recruit a small sample of participants to complete a psychosocial intervention termed Amplification of Positivity (AMP) for individuals experiencing comorbid depression or anxiety disorders and alcohol use disorder (AMP-A). These participants will be asked to provide both qualitative and quantitative input about the AMP-A intervention. Based on their input and clinician input, the AMP-A manual will be modified for use in Phase 2. The goal is to recruit up to 20 participants in order to ensure there will be at least 8 participants who complete all sessions of AMP-A. Phase 2 is a randomized clinical trial (RCT) protocol in which individuals experiencing comorbid depression or anxiety disorders and alcohol use disorder will be randomized to complete AMP-A or an evidence-based cognitive-behavioral therapy (CBT) intervention. Up to 100 participants will be recruited in order to reach a target of N=60. Assessed outcomes will include participant acceptability and completion rates, participant compliance with the intervention, positive and negative affect, substance use- and depression and anxiety-related symptom severity, functional disability, and neural reactivity to reward and alcohol cues during functional magnetic resonance imaging (fMRI).