As a baseball pitcher, don't be bashful about inspecting or fixing a mound yourself before you even throw a warm up pitch. Two very important areas are where your landing foot will hit the ground and the pitching rubber area. Don't hesitate how to sing in tune fill up a hole that quite often is present where most pitchers land with their landing foot. I've seen this landing spot sometimes a foot deep and that is unsafe and your pitch quality will suffer also. You can easily get injured landing into this unsafe, deep hole that should not be there.
Think of the audience as your friends and interact with them while singing. Initially this can be achieved by singing your most favorite songs and ones you are very confident with. As you proceed you will find that as you sing well and interact your confidence level grows. Try to do some deep breathing exercises to calm you down before a performance.
This pitch can be dominating for a right handed pitcher throwing against a left handed batter. You can go up on a batter with this pitch. You can even use it as if it were a slider, just a mini version. It is hard for batters to make contact on this pitch. Sometimes, they will break their bat on point of contact.
Remember to relax if you wish to better singing voice guide. The shoulders must not be hunched and the neck must not be tensed. Keep slightly in motion (such as swaying from each side to the other) to make yourself relax and the voice sounding natural. Breathe in as usual without forcing up the chest so as not to limit the flow of air.
If you watch Nickelodeon or Disney, you have probably seen a video or heard a song from the newest young group called The Jonas Brothers. These three brothers have already made a name for themselves. The group consists singing voice actors Joseph, Kevin and Nicholas. They are a Christian Rock band who has the support of their parents. The band started with Nicholas who was doing an audition in 2005. Nicholas had a solo audition for the executives from Daylight/Columbia records. During a group audition, everyone noticed the talent they had as a team and they couldn't let them go. The boys signed with Daylight/Columbia records.
It is recommended that you continue practicing with the piano as much as you can. By continuing this practice you will eventually master how to sing in tune. It is also suggested that you start changing up the practice with the piano. Instead of singing a straight scale, play random notes on the piano, and try hitting them. This further strengthens your mastery with the notes.