I believe that this free course with vocal exercises for singing is a great resource for singers who wish to improve their vocal skills. It offers a great deal of information and practical demonstrations. Eric, the lecturer, seems to be an experienced vocal coach whose knowledge is visible. He promotes healthy ways of sound production free of strain and tension.
The third lecture explores vocal exercises for singing that improve vocal tone and clear sounds without straining (for example “yah-yah” and staccato “uh-uh” exercises). These exercises focus on releasing the tension from the tongue and on applying an appropriate amount of pressure to produce sounds. Eric offers great explanations about the tongue position and its effect on the vocal tone. He again gives a detailed description of how to practice as well as what not to do.
The first lecture focuses on awakening your whole body and voice for singing. Several simple but effective vocal exercises for singing are introduced to reduce stress and eliminate vocal fatigue, such as yawning as a way of relaxing vocal mechanism and muscles surrounding it, gentle cough as a way to engage your abdomen, lip rolls to support relaxed sound production, and finally head, shoulder and body movements to release tension from the upper body.
The free vocal exercises for singing cover the following topics: opening up the voice, increasing vocal range, improving vocal tone, strengthening the voice and releasing the larynx. In essence, these are not just warm-up exercises but they also develop and strengthen vocal skills.
List of vocalises plus vocalise books and other books providing vocal exercises for singers
Midi scales with text instructions for vocalists to practice their singing online.